Common Weakness Enumeration

CWE-777

Allowed

Regular Expression without Anchors

Abstraction: Variant · Status: Incomplete

API response cwe.mitre.org

The product uses a regular expression to perform neutralization, but the regular expression is not anchored and may allow malicious or malformed data to slip through.

5 vulnerabilities reference this CWE, most recent first.

CVE-2026-56021 (GCVE-0-2026-56021)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:11 – Updated: 2026-06-24 19:54
VLAI
Title
Webmin information disclosure via regex pattern
Summary
Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-185 - Incorrect Regular Expression
  • CWE-777 - Regular Expression without Anchors
Assigner
References
Impacted products
Vendor Product Version
Webmin Webmin Affected: *
Create a notification for this product.
Date Public
2026-06-18 00:00
Credits
Adem El Adeb, vulone.com/vul1.com
Show details on NVD website
To clipboard 

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CVE-2026-40110 (GCVE-0-2026-40110)

Vulnerability from cvelistv5 – Published: 2026-05-05 21:29 – Updated: 2026-07-15 01:01
VLAI
Title
jupyter-server CORS origin validation bypass via unanchored regex in allow_origin_pat
Summary
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the Origin header validation uses Python's re.match() to check incoming origins against the allow_origin_pat configuration value. Because re.match() only anchors at the start of the string and does not require a full match, a pattern intended to match only a trusted domain (e.g., trusted.example.com) will also match any origin that begins with that domain followed by additional characters (e.g., trusted.example.com.evil.com). An attacker who controls such a domain can bypass the CORS origin restriction and make cross-origin requests to the Jupyter Server API from an untrusted site. This issue has been fixed in version 2.18.0.
Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:L/SI:L/SA:L
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-777 - Regular Expression without Anchors
  • CWE-625 - Permissive Regular Expression
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-39087 (GCVE-0-2026-39087)

Vulnerability from cvelistv5 – Published: 2026-04-23 00:00 – Updated: 2026-07-05 16:16
VLAI
Summary
ntfy before 2.22.0 allows SSRF because of an unanchored regular expression for web push endpoint URLs.
Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-777 - Regular Expression without Anchors
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
References
Impacted products
Vendor Product Version
ntfy ntfy Affected: 0 , < 2.22.0 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-94",
                "description": "CWE-94 Improper Control of Generation of Code (\u0027Code Injection\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-23T18:58:16.833Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "ntfy",
          "vendor": "ntfy",
          "versions": [
            {
              "lessThan": "2.22.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ntfy before 2.22.0 allows SSRF because of an unanchored regular expression for web push endpoint URLs."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-777",
              "description": "CWE-777 Regular Expression without Anchors",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-05T16:16:27.697Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://gist.github.com/MightyNawaf/5d41d6e8ead16e217f86b016002ecae5"
        },
        {
          "url": "https://github.com/binwiederhier/ntfy/releases/tag/v2.22.0"
        },
        {
          "url": "https://ntfy.sh"
        }
      ],
      "x_generator": {
        "engine": "enrichogram 0.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-39087",
    "datePublished": "2026-04-23T00:00:00.000Z",
    "dateReserved": "2026-04-06T00:00:00.000Z",
    "dateUpdated": "2026-07-05T16:16:27.697Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-24QX-W28J-9M6P

Vulnerability from github – Published: 2026-05-05 16:54 – Updated: 2026-05-08 15:36
VLAI
Summary
Jupyter Server has a CORS Origin Validation Bypass via `re.match()` in `allow_origin_pat` (from huntr)
Details

Jupyter Server uses re.match() to validate the Origin header against the allow_origin_pat configuration.

Since re.match() only anchors at the start of the string, an attacker who controls a domain like http://trusted.example.com.evil.com/ passes validation against a pattern intended to match only trusted.example.com.

Impact

<=2.17.0

Patches

057869a327c46730afede3eab0ca2d2e3e74acea, 49b34392feaa97735b3b777e3baf8f22f2a14ed8

Workarounds

Wrap your allow_origin_pat value with ^ and $

References

https://github.com/jupyter-server/jupyter_server/pull/603 https://docs.python.org/3/library/re.html#re.fullmatch https://docs.python.org/3/library/re.html#re.match

Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:L/SI:L/SA:L
Show details on source website
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.17.0"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "jupyter-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.18.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40110"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-777"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T16:54:31Z",
    "nvd_published_at": "2026-05-05T22:16:00Z",
    "severity": "HIGH"
  },
  "details": "Jupyter Server uses `re.match()` to validate the Origin header against the `allow_origin_pat` configuration.\n\nSince `re.match()` only anchors at the start of the string, an attacker who controls a domain like `http://trusted.example.com.evil.com/` passes validation against a pattern intended to match only `trusted.example.com`.\n\n### Impact\n\n\u003c=2.17.0\n\n### Patches\n\n057869a327c46730afede3eab0ca2d2e3e74acea, 49b34392feaa97735b3b777e3baf8f22f2a14ed8 \n\n### Workarounds\n\nWrap your `allow_origin_pat` value with `^` and `$`\n\n### References\n\nhttps://github.com/jupyter-server/jupyter_server/pull/603\nhttps://docs.python.org/3/library/re.html#re.fullmatch\nhttps://docs.python.org/3/library/re.html#re.match",
  "id": "GHSA-24qx-w28j-9m6p",
  "modified": "2026-05-08T15:36:16Z",
  "published": "2026-05-05T16:54:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-24qx-w28j-9m6p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40110"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyter-server/jupyter_server/pull/603"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyter-server/jupyter_server/commit/057869a327c46730afede3eab0ca2d2e3e74acea"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jupyter-server/jupyter_server/commit/49b34392feaa97735b3b777e3baf8f22f2a14ed8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jupyter-server/jupyter_server"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:L/SI:L/SA:L",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Jupyter Server has a  CORS Origin Validation Bypass via `re.match()` in `allow_origin_pat` (from huntr)"
}

GHSA-RMMH-P597-PPVV

Vulnerability from github – Published: 2024-02-26 21:31 – Updated: 2026-04-24 20:36
VLAI
Summary
Showdown vulnerable to Regular Expression Denial of Service (ReDoS) in link/anchor parsing
Details

Showdownjs, versions <= 2.1.0, anchors subparser used to parse links has a nested regular expression which can lead to denial of service conditions given malicious input.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "showdown"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.1.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-1899"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-674",
      "CWE-777"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-24T20:36:01Z",
    "nvd_published_at": "2024-02-26T19:15:07Z",
    "severity": "MODERATE"
  },
  "details": "Showdownjs, versions \u003c= 2.1.0, `anchors` subparser used to parse links has a nested regular expression which can lead to denial of service conditions given malicious input.",
  "id": "GHSA-rmmh-p597-ppvv",
  "modified": "2026-04-24T20:36:01Z",
  "published": "2024-02-26T21:31:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-1899"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/showdownjs/showdown"
    },
    {
      "type": "WEB",
      "url": "https://www.tenable.com/security/research/tra-2024-05"
    }
  ],
  "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"
    }
  ],
  "summary": "Showdown vulnerable to Regular Expression Denial of Service (ReDoS) in link/anchor parsing"
}
Mitigation
Implementation

Be sure to understand both what will be matched and what will not be matched by a regular expression. Anchoring the ends of the expression will allow the programmer to define an allowlist strictly limited to what is matched by the text in the regular expression. If you are using a package that only matches one line by default, ensure that you can match multi-line inputs if necessary.

No CAPEC attack patterns related to this CWE.

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