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CVE-2026-62971 (GCVE-0-2026-62971)

Vulnerability from nvd – Published: 2026-11-11 17:27 – Updated: 2026-11-11 17:27

Title

OWASP CRS: XML Attribute Value Bypass

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, CRS rules in the 921 (protocol-attack), 930 (LFI), 931 (RFI), 932 (RCE), 933 (PHP), 934 (generic), 941 (XSS), 942 (SQLi), and 943 (session-fixation) families inspect XML request bodies via the XPath expression XML:/*. That expression matches only element text nodes — it does not match XML attribute values. As a result, an attacker who places an attack payload inside an XML attribute (e.g. <a href="javascript:alert(1)=window.name"></a> or <a value="' OR 1=1 --"></a>) bypasses CRS detection entirely. This is verified empirically against a local CRS test instance and against the public CRS sandbox. The bypass affects approximately 159 rules across 9 rule files and applies at every paranoia level (PL1 through PL4), since the variable list is more or less shared across PLs. The 944 (Java) family is the only one that correctly includes XML://@* in addition to XML:/* and is therefore unaffected. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0.

Severity

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-138 - Improper Neutralization of Special Elements

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/owasp-modsecurity/ModSecurity/…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 3.3.10 Affected: < 4.25.1 Affected: < 4.28.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.10"
            },
            {
              "status": "affected",
              "version": "\u003c 4.25.1"
            },
            {
              "status": "affected",
              "version": "\u003c 4.28.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, CRS rules in the 921 (protocol-attack), 930 (LFI), 931 (RFI), 932 (RCE), 933 (PHP), 934 (generic), 941 (XSS), 942 (SQLi), and 943 (session-fixation) families inspect XML request bodies via the XPath expression XML:/*. That expression matches only element text nodes \u2014 it does not match XML attribute values. As a result, an attacker who places an attack payload inside an XML attribute (e.g. \u003ca href=\"javascript:alert(1)=window.name\"\u003e\u003c/a\u003e or \u003ca value=\"\u0027 OR 1=1 --\"\u003e\u003c/a\u003e) bypasses CRS detection entirely. This is verified empirically against a local CRS test instance and against the public CRS sandbox. The bypass affects approximately 159 rules across 9 rule files and applies at every paranoia level (PL1 through PL4), since the variable list is more or less shared across PLs. The 944 (Java) family is the only one that correctly includes XML://@* in addition to XML:/* and is therefore unaffected. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-138",
              "description": "CWE-138: Improper Neutralization of Special Elements",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-11T17:27:52.994Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-6jp8-c2w2-x7wr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-6jp8-c2w2-x7wr"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/issues/3591",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/issues/3591"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/275d7616f1ceb6f1024c3bfbeb1f4ae2ae9ad010",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/275d7616f1ceb6f1024c3bfbeb1f4ae2ae9ad010"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/635cecf8f81908f02a687db4b5b13a55c3e3b9ed",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/635cecf8f81908f02a687db4b5b13a55c3e3b9ed"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/852036b6af5e81d60d7234f69137d47f4ecb89dc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/852036b6af5e81d60d7234f69137d47f4ecb89dc"
        }
      ],
      "source": {
        "advisory": "GHSA-6jp8-c2w2-x7wr",
        "discovery": "UNKNOWN"
      },
      "title": "OWASP CRS: XML Attribute Value Bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-62971",
    "datePublished": "2026-11-11T17:27:52.994Z",
    "dateReserved": "2026-07-14T22:48:09.780Z",
    "dateUpdated": "2026-11-11T17:27:52.994Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-61619 (GCVE-0-2026-61619)

Vulnerability from nvd – Published: 2026-11-11 17:32 – Updated: 2026-11-11 17:32

Title

OWASP CRS: ReDoS in shared unix-shell-evasion regex-assembly include (12 RCE rules) - PCRE2 backtracking-limit exhaustion causes detection bypass and CPU DoS

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, regular-expression denial of service (ReDoS) affects a shared regex-assembly include used to build 12 Unix RCE detection rules in CRS v4, and the same ambiguous pattern was present in the manually-assembled regexes in 4 rules in CRS v3.3. With a single, unauthenticated, crafted request, the generated pattern drives PCRE2 past its backtracking limit. When PCRE2 exceeds that limit, the @rx operator returns an error rather than a match result, which results in detection bypass and CPU denial of service. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0.

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 3.3.10 Affected: < 4.25.1 Affected: < 4.28.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.10"
            },
            {
              "status": "affected",
              "version": "\u003c 4.25.1"
            },
            {
              "status": "affected",
              "version": "\u003c 4.28.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, regular-expression denial of service (ReDoS) affects a shared regex-assembly include used to build 12 Unix RCE detection rules in CRS v4, and the same ambiguous pattern was present in the manually-assembled regexes in 4 rules in CRS v3.3. With a single, unauthenticated, crafted request, the generated pattern drives PCRE2 past its backtracking limit. When PCRE2 exceeds that limit, the @rx operator returns an error rather than a match result, which results in detection bypass and CPU denial of service. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1333",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-11T17:32:41.641Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-f5qm-3h4p-8qhg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-f5qm-3h4p-8qhg"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/4665b6d7a79a81aa8a802ef3c901d69491c009a4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/4665b6d7a79a81aa8a802ef3c901d69491c009a4"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/6083611d00291e85ab7b587e96577deb53ed9cac",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/6083611d00291e85ab7b587e96577deb53ed9cac"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/e3b612a909532dcc8d056c01ac04b31117b71505",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/e3b612a909532dcc8d056c01ac04b31117b71505"
        }
      ],
      "source": {
        "advisory": "GHSA-f5qm-3h4p-8qhg",
        "discovery": "UNKNOWN"
      },
      "title": "OWASP CRS: ReDoS in shared unix-shell-evasion regex-assembly include (12 RCE rules) - PCRE2 backtracking-limit exhaustion causes detection bypass and CPU DoS"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61619",
    "datePublished": "2026-11-11T17:32:41.641Z",
    "dateReserved": "2026-07-10T17:36:04.598Z",
    "dateUpdated": "2026-11-11T17:32:41.641Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-33691 (GCVE-0-2026-33691)

Vulnerability from nvd – Published: 2026-04-02 15:03 – Updated: 2026-04-18 19:16

Title

OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-02 17:38 UTC

CWE

CWE-178 - Improper Handling of Case Sensitivity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

10 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/coreruleset/coreruleset/pull/4546	x_refsource_MISC
https://github.com/coreruleset/coreruleset/pull/4547	x_refsource_MISC
https://github.com/coreruleset/coreruleset/pull/4548	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/03/29/2
http://seclists.org/fulldisclosure/2026/Apr/0
http://www.openwall.com/lists/oss-security/2026/04/18/4

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 3.3.9 Affected: >= 4.0.0-rc1, < 4.25.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-04-18T19:16:54.006Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/29/2"
          },
          {
            "url": "http://seclists.org/fulldisclosure/2026/Apr/0"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/04/18/4"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33691",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-02T17:38:01.007742Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-02T17:38:10.247Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.9"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.0.0-rc1, \u003c 4.25.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
            "version": "3.1"
          }
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      ],
      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-178",
              "description": "CWE-178: Improper Handling of Case Sensitivity",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-02T15:03:52.126Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
        {
          "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w",
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            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/pull/4546",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/pull/4546"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/pull/4547",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/pull/4547"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/pull/4548",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/pull/4548"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0"
        }
      ],
      "source": {
        "advisory": "GHSA-rw5f-9w43-gv2w",
        "discovery": "UNKNOWN"
      },
      "title": "OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33691",
    "datePublished": "2026-04-02T15:03:52.126Z",
    "dateReserved": "2026-03-23T16:34:59.932Z",
    "dateUpdated": "2026-04-18T19:16:54.006Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-21876 (GCVE-0-2026-21876)

Vulnerability from nvd – Published: 2026-01-08 13:55 – Updated: 2026-04-09 15:41

Title

OWASP CRS has multipart bypass using multiple content-type parts

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.

Severity

9.3 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-08 14:52 UTC

CWE

CWE-794 - Incomplete Filtering of Multiple Instances of Special Elements

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
https://github.com/daytriftnewgen/CVE-2026-21876	exploit

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 4.22.0 Affected: < 3.3.8

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21876",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-08T14:52:48.615550Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-09T15:41:17.073Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/daytriftnewgen/CVE-2026-21876"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.22.0"
            },
            {
              "status": "affected",
              "version": "\u003c 3.3.8"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-794",
              "description": "CWE-794: Incomplete Filtering of Multiple Instances of Special Elements",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-08T13:55:37.102Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-36fv-25j3-r2c5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-36fv-25j3-r2c5"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/80d80473abf71bd49bf6d3c1ab221e3c74e4eb83",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/80d80473abf71bd49bf6d3c1ab221e3c74e4eb83"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/9917985de09a6cf38b3261faf9105e909d67a7d6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/9917985de09a6cf38b3261faf9105e909d67a7d6"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.8",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/releases/tag/v3.3.8"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/releases/tag/v4.22.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/releases/tag/v4.22.0"
        }
      ],
      "source": {
        "advisory": "GHSA-36fv-25j3-r2c5",
        "discovery": "UNKNOWN"
      },
      "title": "OWASP CRS has multipart bypass using multiple content-type parts"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-21876",
    "datePublished": "2026-01-08T13:55:37.102Z",
    "dateReserved": "2026-01-05T17:24:36.927Z",
    "dateUpdated": "2026-04-09T15:41:17.073Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-61619 (GCVE-0-2026-61619)

Vulnerability from cvelistv5 – Published: 2026-11-11 17:32 – Updated: 2026-11-11 17:32

Title

OWASP CRS: ReDoS in shared unix-shell-evasion regex-assembly include (12 RCE rules) - PCRE2 backtracking-limit exhaustion causes detection bypass and CPU DoS

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, regular-expression denial of service (ReDoS) affects a shared regex-assembly include used to build 12 Unix RCE detection rules in CRS v4, and the same ambiguous pattern was present in the manually-assembled regexes in 4 rules in CRS v3.3. With a single, unauthenticated, crafted request, the generated pattern drives PCRE2 past its backtracking limit. When PCRE2 exceeds that limit, the @rx operator returns an error rather than a match result, which results in detection bypass and CPU denial of service. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0.

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 3.3.10 Affected: < 4.25.1 Affected: < 4.28.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.10"
            },
            {
              "status": "affected",
              "version": "\u003c 4.25.1"
            },
            {
              "status": "affected",
              "version": "\u003c 4.28.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, regular-expression denial of service (ReDoS) affects a shared regex-assembly include used to build 12 Unix RCE detection rules in CRS v4, and the same ambiguous pattern was present in the manually-assembled regexes in 4 rules in CRS v3.3. With a single, unauthenticated, crafted request, the generated pattern drives PCRE2 past its backtracking limit. When PCRE2 exceeds that limit, the @rx operator returns an error rather than a match result, which results in detection bypass and CPU denial of service. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1333",
              "description": "CWE-1333: Inefficient Regular Expression Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-11T17:32:41.641Z",
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      },
      "references": [
        {
          "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-f5qm-3h4p-8qhg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-f5qm-3h4p-8qhg"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/4665b6d7a79a81aa8a802ef3c901d69491c009a4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/4665b6d7a79a81aa8a802ef3c901d69491c009a4"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/6083611d00291e85ab7b587e96577deb53ed9cac",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/6083611d00291e85ab7b587e96577deb53ed9cac"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/e3b612a909532dcc8d056c01ac04b31117b71505",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/e3b612a909532dcc8d056c01ac04b31117b71505"
        }
      ],
      "source": {
        "advisory": "GHSA-f5qm-3h4p-8qhg",
        "discovery": "UNKNOWN"
      },
      "title": "OWASP CRS: ReDoS in shared unix-shell-evasion regex-assembly include (12 RCE rules) - PCRE2 backtracking-limit exhaustion causes detection bypass and CPU DoS"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61619",
    "datePublished": "2026-11-11T17:32:41.641Z",
    "dateReserved": "2026-07-10T17:36:04.598Z",
    "dateUpdated": "2026-11-11T17:32:41.641Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-62971 (GCVE-0-2026-62971)

Vulnerability from cvelistv5 – Published: 2026-11-11 17:27 – Updated: 2026-11-11 17:27

Title

OWASP CRS: XML Attribute Value Bypass

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, CRS rules in the 921 (protocol-attack), 930 (LFI), 931 (RFI), 932 (RCE), 933 (PHP), 934 (generic), 941 (XSS), 942 (SQLi), and 943 (session-fixation) families inspect XML request bodies via the XPath expression XML:/*. That expression matches only element text nodes — it does not match XML attribute values. As a result, an attacker who places an attack payload inside an XML attribute (e.g. <a href="javascript:alert(1)=window.name"></a> or <a value="' OR 1=1 --"></a>) bypasses CRS detection entirely. This is verified empirically against a local CRS test instance and against the public CRS sandbox. The bypass affects approximately 159 rules across 9 rule files and applies at every paranoia level (PL1 through PL4), since the variable list is more or less shared across PLs. The 944 (Java) family is the only one that correctly includes XML://@* in addition to XML:/* and is therefore unaffected. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0.

Severity

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-138 - Improper Neutralization of Special Elements

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/owasp-modsecurity/ModSecurity/…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 3.3.10 Affected: < 4.25.1 Affected: < 4.28.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.3.10"
            },
            {
              "status": "affected",
              "version": "\u003c 4.25.1"
            },
            {
              "status": "affected",
              "version": "\u003c 4.28.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.10, 4.25.1, and 4.28.0, CRS rules in the 921 (protocol-attack), 930 (LFI), 931 (RFI), 932 (RCE), 933 (PHP), 934 (generic), 941 (XSS), 942 (SQLi), and 943 (session-fixation) families inspect XML request bodies via the XPath expression XML:/*. That expression matches only element text nodes \u2014 it does not match XML attribute values. As a result, an attacker who places an attack payload inside an XML attribute (e.g. \u003ca href=\"javascript:alert(1)=window.name\"\u003e\u003c/a\u003e or \u003ca value=\"\u0027 OR 1=1 --\"\u003e\u003c/a\u003e) bypasses CRS detection entirely. This is verified empirically against a local CRS test instance and against the public CRS sandbox. The bypass affects approximately 159 rules across 9 rule files and applies at every paranoia level (PL1 through PL4), since the variable list is more or less shared across PLs. The 944 (Java) family is the only one that correctly includes XML://@* in addition to XML:/* and is therefore unaffected. This issue has been patched in versions 3.3.10, 4.25.1, and 4.28.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-138",
              "description": "CWE-138: Improper Neutralization of Special Elements",
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        "dateUpdated": "2026-11-11T17:27:52.994Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-6jp8-c2w2-x7wr",
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            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/coreruleset/coreruleset/security/advisories/GHSA-6jp8-c2w2-x7wr"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/issues/3591",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/issues/3591"
        },
        {
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/coreruleset/coreruleset/commit/275d7616f1ceb6f1024c3bfbeb1f4ae2ae9ad010"
        },
        {
          "name": "https://github.com/coreruleset/coreruleset/commit/635cecf8f81908f02a687db4b5b13a55c3e3b9ed",
          "tags": [
            "x_refsource_MISC"
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          "tags": [
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      ],
      "source": {
        "advisory": "GHSA-6jp8-c2w2-x7wr",
        "discovery": "UNKNOWN"
      },
      "title": "OWASP CRS: XML Attribute Value Bypass"
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  },
  "dataType": "CVE_RECORD",
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}

CVE-2026-33691 (GCVE-0-2026-33691)

Vulnerability from cvelistv5 – Published: 2026-04-02 15:03 – Updated: 2026-04-18 19:16

Title

OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-02 17:38 UTC

CWE

CWE-178 - Improper Handling of Case Sensitivity

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

10 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/coreruleset/coreruleset/pull/4546	x_refsource_MISC
https://github.com/coreruleset/coreruleset/pull/4547	x_refsource_MISC
https://github.com/coreruleset/coreruleset/pull/4548	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/03/29/2
http://seclists.org/fulldisclosure/2026/Apr/0
http://www.openwall.com/lists/oss-security/2026/04/18/4

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 3.3.9 Affected: >= 4.0.0-rc1, < 4.25.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-04-18T19:16:54.006Z",
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          },
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          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/04/18/4"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33691",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-02T17:38:01.007742Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-02T17:38:10.247Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
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          "product": "coreruleset",
          "vendor": "coreruleset",
          "versions": [
            {
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              "version": "\u003c 3.3.9"
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          "lang": "en",
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CVE-2026-21876 (GCVE-0-2026-21876)

Vulnerability from cvelistv5 – Published: 2026-01-08 13:55 – Updated: 2026-04-09 15:41

Title

OWASP CRS has multipart bypass using multiple content-type parts

Summary

The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 4.22.0 and 3.3.8, the current rule 922110 has a bug when processing multipart requests with multiple parts. When the first rule in a chain iterates over a collection (like `MULTIPART_PART_HEADERS`), the capture variables (`TX:0`, `TX:1`) get overwritten with each iteration. Only the last captured value is available to the chained rule, which means malicious charsets in earlier parts can be missed if a later part has a legitimate charset. Versions 4.22.0 and 3.3.8 patch the issue.

Severity

9.3 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-08 14:52 UTC

CWE

CWE-794 - Incomplete Filtering of Multiple Instances of Special Elements

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7757 records in the last 180 days details

References

6 references

URL	Tags
https://github.com/coreruleset/coreruleset/securi…	x_refsource_CONFIRM
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/commit…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
https://github.com/coreruleset/coreruleset/releas…	x_refsource_MISC
https://github.com/daytriftnewgen/CVE-2026-21876	exploit

Impacted products

1 product

Vendor	Product	Version
coreruleset	coreruleset	Affected: < 4.22.0 Affected: < 3.3.8

Show details on NVD website

JSON

To clipboard

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Find a vulnerability

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8 vulnerabilities by coreruleset

CVE-2026-62971 (GCVE-0-2026-62971)

CVE-2026-61619 (GCVE-0-2026-61619)

CVE-2026-33691 (GCVE-0-2026-33691)

CVE-2026-21876 (GCVE-0-2026-21876)

CVE-2026-61619 (GCVE-0-2026-61619)

CVE-2026-62971 (GCVE-0-2026-62971)

CVE-2026-33691 (GCVE-0-2026-33691)

CVE-2026-21876 (GCVE-0-2026-21876)

Find a vulnerability

Search criteria ⓘ Use this form to refine search results. Full-text search supports keyword queries with ranking and filtering. You can combine vendor, product, and sources to narrow results. Enable “Apply ordering” to sort by date instead of relevance.

8 vulnerabilities by coreruleset

CVE-2026-62971 (GCVE-0-2026-62971)

CVE-2026-61619 (GCVE-0-2026-61619)

CVE-2026-33691 (GCVE-0-2026-33691)

CVE-2026-21876 (GCVE-0-2026-21876)

CVE-2026-61619 (GCVE-0-2026-61619)

CVE-2026-62971 (GCVE-0-2026-62971)

CVE-2026-33691 (GCVE-0-2026-33691)

CVE-2026-21876 (GCVE-0-2026-21876)

Search criteria ⓘ Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.