Vulnerability-Lookup

CVE-2026-75805 (GCVE-0-2026-75805)

Vulnerability from cvelistv5 – Published: 2026-09-29 15:32 – Updated: 2026-09-29 16:54

Title

NULL Pointer Dereference in CMP Client Revocation Response Handling

Summary

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application. CWE: CWE-476: NULL-pointer dereference Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr <file>' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API. A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash. The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected. FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-29 16:54 UTC

CWE

CWE-476 - NULL-pointer dereference

Assigner

openssl CNA under the mitre root

CNA scorecard B 78/100 over 43 records in the last 180 days details

References

5 references

URL	Tags
https://openssl-library.org/news/secadv/20260929.txt	vendor-advisory
https://github.com/openssl/openssl/commit/7ca0ccb…	patch
https://github.com/openssl/openssl/commit/7588db7…	patch
https://github.com/openssl/openssl/commit/9eb2a8a…	patch
https://github.com/openssl/openssl/commit/abf0287…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
OpenSSL	OpenSSL	Affected: 4.0.0 , < 4.0.3 (semver) Affected: 3.6.0 , < 3.6.5 (semver) Affected: 3.5.0 , < 3.5.9 (semver) Affected: 3.4.0 , < 3.4.8 (semver) Affected: 3.0.0 , < 3.0.23 (semver)	guessed

Date Public

2026-09-29 14:21

Credits

Bhabani Sankar Das Bhabani Sankar Das Norbert Pocs

Show details on NVD website

JSON

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              "vendor": "OpenSSL",
              "versions": [
                {
                  "lessThan": "4.0.3",
                  "status": "affected",
                  "version": "4.0.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.6.5",
                  "status": "affected",
                  "version": "3.6.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.5.9",
                  "status": "affected",
                  "version": "3.5.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.4.8",
                  "status": "affected",
                  "version": "3.4.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "3.0.23",
                  "status": "affected",
                  "version": "3.0.0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "Bhabani Sankar Das"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Bhabani Sankar Das"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Norbert Pocs"
            }
          ],
          "datePublic": "2026-09-29T14:21:57.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "Issue summary: A CMP client that requests certificate revocation on the basis\u003cbr\u003eof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\u003cbr\u003eprocessing a crafted revocation response. \u003cbr\u003e\u003cbr\u003eImpact summary: The NULL pointer dereference happens on a read which \u003cbr\u003eleads to a crash and a Denial of Service for the affected client application.\u003cbr\u003e\u003cbr\u003eCWE: CWE-476: NULL-pointer dereference\u003cbr\u003e\u003cbr\u003eDescription: A CMP client revoking a certificate has to tell the server which\u003cbr\u003ecertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\u003cbr\u003ecertificate itself or its issuer name and serial number. This is\u003cbr\u003e\u0027openssl cmp -cmd rr -csr \u003cfile\u003e\u0027 on the command line, or\u003cbr\u003eOSSL_CMP_exec_RR_ses() with the certificate supplied via\u003cbr\u003eOSSL_CMP_CTX_set1_p10CSR() through the API.\u003cbr\u003e\u003cbr\u003eA CSR does not contain the issuer name and serial number of the certificate,\u003cbr\u003eso the client does not send them. A server may optionally name the\u003cbr\u003ecertificate it revoked in its response, and the client then compares that\u003cbr\u003ename against what it sent. Having sent neither an issuer name nor a serial\u003cbr\u003enumber, it has nothing to compare against, and a server returning a specially\u003cbr\u003ecrafted name causes the client to read from a NULL pointer and crash.\u003cbr\u003e\u003cbr\u003eThe revocation response is checked for valid message protection before\u003cbr\u003ethe affected code is reached, so an attacker must be a malicious or\u003cbr\u003ecompromised CMP server, or a man-in-the-middle in possession of the\u003cbr\u003esecret used for message protection. Clients that identify the certificate\u003cbr\u003eto be revoked by a certificate or by issuer and serial number rather\u003cbr\u003ethan by a PKCS#10 CSR are not affected.\u003cbr\u003e\u003cbr\u003eFIPS impact: no\u003cbr\u003eNo FIPS modules are affected by this issue, as the CMP protocol\u003cbr\u003eimplementation is outside the OpenSSL FIPS module boundary."
                }
              ],
              "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n\u0027openssl cmp -cmd rr -csr \u003cfile\u003e\u0027 on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
            }
          ],
          "metrics": [
            {
              "format": "other",
              "other": {
                "content": {
                  "text": "Low"
                },
                "type": "https://openssl-library.org/policies/general/security-policy/"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-476",
                  "description": "CWE-476 NULL-pointer dereference",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-09-29T15:32:20.408Z",
            "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
            "shortName": "openssl"
          },
          "references": [
            {
              "name": "OpenSSL Advisory",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://openssl-library.org/news/secadv/20260929.txt"
            },
            {
              "name": "4.0.3 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
            },
            {
              "name": "3.6.5 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
            },
            {
              "name": "3.5.9 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
            },
            {
              "name": "3.4.8 git commit",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "NULL Pointer Dereference in CMP Client Revocation Response Handling",
          "x_generator": {
            "engine": "Vulnogram 0.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "assignerShortName": "openssl",
        "cveId": "CVE-2026-75805",
        "datePublished": "2026-09-29T15:32:20.408Z",
        "dateReserved": "2026-08-18T09:34:32.659Z",
        "dateUpdated": "2026-09-29T16:54:39.263Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

BELL-CVE-2026-75805 (CVE-2026-75805)

Vulnerability from osv_bellsoft – Published: 2026-09-30 06:05 – Updated: 2026-10-10 06:01 – Source website

Severity

5.3 (Medium)


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

References

URL

Type

https://docs.bell-sw.com/security/cves/CVE-2026-75805

ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Alpaquita:23",
        "name": "openssl",
        "purl": "pkg:apk/alpaquita/openssl?arch=source\u0026distro=23"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.8-r4"
            },
            {
              "fixed": "3.0.22-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:25",
        "name": "openssl",
        "purl": "pkg:apk/alpaquita/openssl?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0-r0"
            },
            {
              "fixed": "3.5.9-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:stream",
        "name": "openssl",
        "purl": "pkg:apk/alpaquita/openssl?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.1-r1"
            },
            {
              "fixed": "3.5.9-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "BellSoft Hardened Containers:23",
        "name": "openssl",
        "purl": "pkg:apk/bellsoft-hardened-containers/openssl?arch=source\u0026distro=23"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.8-r4"
            },
            {
              "fixed": "3.0.22-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "BellSoft Hardened Containers:25",
        "name": "openssl",
        "purl": "pkg:apk/bellsoft-hardened-containers/openssl?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.5.0-r0"
            },
            {
              "fixed": "3.5.9-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "BellSoft Hardened Containers:stream",
        "name": "openssl",
        "purl": "pkg:apk/bellsoft-hardened-containers/openssl?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.1.1-r1"
            },
            {
              "fixed": "3.5.9-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "id": "BELL-CVE-2026-75805",
  "modified": "2026-10-10T06:01:10.136767Z",
  "published": "2026-09-30T06:05:12.572744Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://docs.bell-sw.com/security/cves/CVE-2026-75805"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-75805"
  ]
}

CERTFR-2026-AVI-1241

Vulnerability from certfr_avis - Published: 2026-09-30 - Updated: 2026-09-30

De multiples vulnérabilités ont été découvertes dans OpenSSL. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
OpenSSL	OpenSSL	OpenSSL versions 3.6.x antérieures à 3.6.5
OpenSSL	OpenSSL	OpenSSL versions 3.5.x antérieures à 3.5.9
OpenSSL	OpenSSL	OpenSSL versions 1.0.2x antérieures à 1.0.2zs
OpenSSL	OpenSSL	OpenSSL versions 1.1.1x antérieures à 1.1.1zj
OpenSSL	OpenSSL	OpenSSL versions 3.0.x antérieures à 3.0.23
OpenSSL	OpenSSL	OpenSSL versions 4.0.x antérieures à 4.0.3
OpenSSL	OpenSSL	OpenSSL versions 3.4.x antérieures à 3.4.8

References

Title

Publication Time

CLEANSTART-2026-SF17865 (CVE-2026-75805)

Vulnerability from cleanstart – Published: 2026-10-22 00:42 – Updated: 2026-10-21 08:18 – Source website

Summary

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response

Details

CVE-2026-75805 affects multiple packages. Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. See references for individual vulnerability details.

Severity

5.3 (Medium)


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

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-75805	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-75805	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "miniforge3",
        "purl": "pkg:apk/cleanstart/miniforge3?arch=x86_64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.1.1.3-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "miniforge3",
        "purl": "pkg:apk/cleanstart/miniforge3?arch=aarch64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.1.1.3-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "miniforge3",
        "purl": "pkg:apk/cleanstart/miniforge3?arch=x86_64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.3.2.0-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "miniforge3",
        "purl": "pkg:apk/cleanstart/miniforge3?arch=aarch64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.3.2.0-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "miniforge3",
        "purl": "pkg:apk/cleanstart/miniforge3?arch=x86_64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.3.2.3-r3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "miniforge3",
        "purl": "pkg:apk/cleanstart/miniforge3?arch=aarch64"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.3.2.3-r3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "CVE-2026-75805 affects multiple packages. Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response. See references for individual vulnerability details.",
  "id": "CLEANSTART-2026-SF17865",
  "modified": "2026-10-21T08:18:29Z",
  "published": "2026-10-22T00:42:09.137875Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-SF17865.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-75805"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75805"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response",
  "upstream": [
    "CVE-2026-75805"
  ]
}

FKIE_CVE-2026-75805

Vulnerability from fkie_nvd - Published: 2026-09-29 16:17 - Updated: 2026-10-08 01:20

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

URL	Tags
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166	Patch
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7	Patch
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3	Patch
openssl-security@openssl.org	https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f	Patch
openssl-security@openssl.org	https://openssl-library.org/news/secadv/20260929.txt	Vendor Advisory

Impacted products

Vendor	Product	Version
openssl	openssl	*
openssl	openssl	*
openssl	openssl	*
openssl	openssl	*
openssl	openssl	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "4.0.3",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.6.5",
              "status": "affected",
              "version": "3.6.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.5.9",
              "status": "affected",
              "version": "3.5.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.4.8",
              "status": "affected",
              "version": "3.4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "3.0.23",
              "status": "affected",
              "version": "3.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "openssl-security@openssl.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C9AFA409-BE77-40FB-8191-3405AC8F52C0",
              "versionEndExcluding": "3.0.23",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "707E1EC7-0538-4F9F-96CB-C89FECC1F3ED",
              "versionEndExcluding": "3.4.8",
              "versionStartIncluding": "3.4.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B822E02B-8728-4C34-98BC-52D0A0A735B3",
              "versionEndExcluding": "3.5.9",
              "versionStartIncluding": "3.5.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "96C892B6-618B-4CB9-85B6-76C641D17532",
              "versionEndExcluding": "3.6.5",
              "versionStartIncluding": "3.6.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "BC4A99CC-483D-4C81-A95F-6AEB2BF1B500",
              "versionEndExcluding": "4.0.3",
              "versionStartIncluding": "4.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n\u0027openssl cmp -cmd rr -csr \u003cfile\u003e\u0027 on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary."
    }
  ],
  "id": "CVE-2026-75805",
  "lastModified": "2026-10-08T01:20:24.147",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-75805",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-29T16:54:03.315064Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-29T16:17:11.063",
  "references": [
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
    },
    {
      "source": "openssl-security@openssl.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://openssl-library.org/news/secadv/20260929.txt"
    }
  ],
  "sourceIdentifier": "openssl-security@openssl.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "openssl-security@openssl.org",
      "type": "Secondary"
    }
  ]
}

GHSA-GPG3-M652-F2VC

Vulnerability from github – Published: 2026-09-29 18:31 – Updated: 2026-09-29 18:31

Details

Issue summary: A CMP client that requests certificate revocation on the basis of a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when processing a crafted revocation response.

Impact summary: The NULL pointer dereference happens on a read which leads to a crash and a Denial of Service for the affected client application.

CWE: CWE-476: NULL-pointer dereference

Description: A CMP client revoking a certificate has to tell the server which certificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the certificate itself or its issuer name and serial number. This is 'openssl cmp -cmd rr -csr ' on the command line, or OSSL_CMP_exec_RR_ses() with the certificate supplied via OSSL_CMP_CTX_set1_p10CSR() through the API.

A CSR does not contain the issuer name and serial number of the certificate, so the client does not send them. A server may optionally name the certificate it revoked in its response, and the client then compares that name against what it sent. Having sent neither an issuer name nor a serial number, it has nothing to compare against, and a server returning a specially crafted name causes the client to read from a NULL pointer and crash.

The revocation response is checked for valid message protection before the affected code is reached, so an attacker must be a malicious or compromised CMP server, or a man-in-the-middle in possession of the secret used for message protection. Clients that identify the certificate to be revoked by a certificate or by issuer and serial number rather than by a PKCS#10 CSR are not affected.

FIPS impact: no No FIPS modules are affected by this issue, as the CMP protocol implementation is outside the OpenSSL FIPS module boundary.

Severity

5.3 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-75805"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-29T16:17:11Z",
    "severity": "MODERATE"
  },
  "details": "Issue summary: A CMP client that requests certificate revocation on the basis\nof a PKCS#10 CSR may dereference a NULL pointer and terminate abnormally when\nprocessing a crafted revocation response. \n\nImpact summary: The NULL pointer dereference happens on a read which \nleads to a crash and a Denial of Service for the affected client application.\n\nCWE: CWE-476: NULL-pointer dereference\n\nDescription: A CMP client revoking a certificate has to tell the server which\ncertificate to revoke, and may do so by supplying a PKCS#10 CSR instead of the\ncertificate itself or its issuer name and serial number. This is\n\u0027openssl cmp -cmd rr -csr \u003cfile\u003e\u0027 on the command line, or\nOSSL_CMP_exec_RR_ses() with the certificate supplied via\nOSSL_CMP_CTX_set1_p10CSR() through the API.\n\nA CSR does not contain the issuer name and serial number of the certificate,\nso the client does not send them. A server may optionally name the\ncertificate it revoked in its response, and the client then compares that\nname against what it sent. Having sent neither an issuer name nor a serial\nnumber, it has nothing to compare against, and a server returning a specially\ncrafted name causes the client to read from a NULL pointer and crash.\n\nThe revocation response is checked for valid message protection before\nthe affected code is reached, so an attacker must be a malicious or\ncompromised CMP server, or a man-in-the-middle in possession of the\nsecret used for message protection. Clients that identify the certificate\nto be revoked by a certificate or by issuer and serial number rather\nthan by a PKCS#10 CSR are not affected.\n\nFIPS impact: no\nNo FIPS modules are affected by this issue, as the CMP protocol\nimplementation is outside the OpenSSL FIPS module boundary.",
  "id": "GHSA-gpg3-m652-f2vc",
  "modified": "2026-09-29T18:31:44Z",
  "published": "2026-09-29T18:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75805"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/7588db7fef14209c3caa3a101d11a02006b19166"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/7ca0ccb5172a577e9b87267d77bfe21e5481a5e7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/9eb2a8a9b86136cdb39d6d7d50644dd66941cdc3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openssl/openssl/commit/abf02872a4b71767ecc72293424420f5b009190f"
    },
    {
      "type": "WEB",
      "url": "https://openssl-library.org/news/secadv/20260929.txt"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

MSRC_CVE-2026-75805

Vulnerability from csaf_microsoft - Published: 2026-10-03 01:11 - Updated: 2026-10-16 01:46

Summary

NULL Pointer Dereference in CMP Client Revocation Response Handling

Scope

1 vulnerability in this advisory, including CVE-2026-75805.

CVE-2026-75805

5.3 (Medium)


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

Fixed: 2 products Known affected: 2 products Known not affected: 6 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:22102-1

Vulnerability from csaf_opensuse - Published: 2026-10-14 15:02 - Updated: 2026-10-19 17:25

Summary

Security update for openssl-3

Severity

Important

Scope

11 vulnerabilities in this advisory, including CVE-2026-75805.

CVE-2026-75805

5.3 (Medium)


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

Recommended: 19 products

Open the full advisory

RHSA-2026:74162

Vulnerability from csaf_redhat - Published: 2026-09-30 23:32 - Updated: 2026-10-21 19:41

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-75805.

CVE-2026-75805

A flaw was found in OpenSSL. When a Certificate Management Protocol (CMP) client requests certificate revocation using a PKCS#10 Certificate Signing Request (CSR), it omits the certificate issuer name and serial number. A malicious or compromised CMP server, or an attacker possessing valid message protection credentials, can exploit this flaw by returning a crafted revocation response. This triggers a NULL pointer dereference when the client attempts to compare response data, causing the client application to crash and resulting in a Denial of Service (DoS).

5.9 (Medium)


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

Fixed: 15 products

https://access.redhat.com/errata/RHSA-2026:74162

Open the full advisory

RHSA-2026:74166

Vulnerability from csaf_redhat - Published: 2026-09-30 23:37 - Updated: 2026-10-21 19:41

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

13 vulnerabilities in this advisory, including CVE-2026-75805.

CVE-2026-75805

5.9 (Medium)


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

Fixed: 7 products

https://access.redhat.com/errata/RHSA-2026:74166

Open the full advisory

SUSE-SU-2026:24133-1

Vulnerability from csaf_suse - Published: 2026-10-09 11:48 - Updated: 2026-10-14 16:41

Summary

Security update for openssl-3

Severity

Important

Scope

6 vulnerabilities in this advisory, including CVE-2026-75805.

CVE-2026-75805

5.3 (Medium)


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

Recommended: 12 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-75805 (GCVE-0-2026-75805)

BELL-CVE-2026-75805 (CVE-2026-75805)

Solutions

CLEANSTART-2026-SF17865 (CVE-2026-75805)

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