Vulnerability-Lookup

GHSA-Q4HV-HFJ9-X4R5

Vulnerability from github – Published: 2026-10-23 21:36 – Updated: 2026-10-24 00:32

Details

HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions.

_language_match interpolates each Accept-Language range into the pattern /^$range\-/i without escaping it, so regular expression syntax in the header reaches the regex engine. A 12-byte range such as (a?|b?){26}z backtracks for seconds, and each increment of the quantifier doubles the time. An invalid range such as ( fails to compile.

A remote attacker can exhaust CPU, or make choose_language die, in any application that passes an untrusted Accept-Language header to it.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-113877"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-624"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-23T21:17:21Z",
    "severity": null
  },
  "details": "HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions.\n\n_language_match interpolates each Accept-Language range into the pattern `/^$range\\-/i` without escaping it, so regular expression syntax in the header reaches the regex engine. A 12-byte range such as `(a?|b?){26}z` backtracks for seconds, and each increment of the quantifier doubles the time. An invalid range such as `(` fails to compile.\n\nA remote attacker can exhaust CPU, or make choose_language die, in any application that passes an untrusted Accept-Language header to it.",
  "id": "GHSA-q4hv-hfj9-x4r5",
  "modified": "2026-10-24T00:32:33Z",
  "published": "2026-10-23T21:36:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113877"
    },
    {
      "type": "WEB",
      "url": "https://github.com/robrwo/perl-HTTP-Headers-ActionPack/commit/77f0deb23f3de872c2e64befd72750e0f0f4bec9.patch"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/RRWO/HTTP-Headers-ActionPack-0.10/changes"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/10/23/27"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-113877 (GCVE-0-2026-113877)

Vulnerability from cvelistv5 – Published: 2026-10-23 20:07 – Updated: 2026-10-23 23:06

Title

HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions

Summary

HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions. _language_match interpolates each Accept-Language range into the pattern `/^$range\-/i` without escaping it, so regular expression syntax in the header reaches the regex engine. A 12-byte range such as `(a?|b?){26}z` backtracks for seconds, and each increment of the quantifier doubles the time. An invalid range such as `(` fails to compile. A remote attacker can exhaust CPU, or make choose_language die, in any application that passes an untrusted Accept-Language header to it.

Severity

No CVSS data available.

CWE

CWE-624 - Executable Regular Expression Error

Assigner

CPANSec CNA under the redhat root

CNA scorecard C 63/100 over 299 records in the last 180 days details

References

3 references

URL	Tags
https://metacpan.org/release/RRWO/HTTP-Headers-Ac…	release-notes
https://github.com/robrwo/perl-HTTP-Headers-Actio…	patch
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , < 0.10 (custom)

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JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-10-23T23:06:45.441Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/10/23/27"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "HTTP::Headers::ActionPack"
          ],
          "packageName": "HTTP-Headers-ActionPack",
          "packageURL": "pkg:cpan/HTTP-Headers-ActionPack",
          "programFiles": [
            "lib/HTTP/Headers/ActionPack/ContentNegotiation.pm"
          ],
          "programRoutines": [
            {
              "name": "HTTP::Headers::ActionPack::ContentNegotiation::_language_match"
            },
            {
              "name": "HTTP::Headers::ActionPack::ContentNegotiation::choose_language"
            }
          ],
          "repo": "https://github.com/robrwo/perl-HTTP-Headers-ActionPack/",
          "versions": [
            {
              "lessThan": "0.10",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions.\n\n_language_match interpolates each Accept-Language range into the pattern `/^$range\\-/i` without escaping it, so regular expression syntax in the header reaches the regex engine. A 12-byte range such as `(a?|b?){26}z` backtracks for seconds, and each increment of the quantifier doubles the time. An invalid range such as `(` fails to compile.\n\nA remote attacker can exhaust CPU, or make choose_language die, in any application that passes an untrusted Accept-Language header to it."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-624",
              "description": "CWE-624 Executable Regular Expression Error",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T20:07:20.677Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/RRWO/HTTP-Headers-ActionPack-0.10/changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/robrwo/perl-HTTP-Headers-ActionPack/commit/77f0deb23f3de872c2e64befd72750e0f0f4bec9.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to HTTP-Headers-ActionPack 0.10 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "HTTP::Headers::ActionPack versions before 0.10 for Perl allow CPU exhaustion via Accept-Language ranges matched as regular expressions",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-113877",
    "datePublished": "2026-10-23T20:07:20.677Z",
    "dateReserved": "2026-10-20T20:16:52.798Z",
    "dateUpdated": "2026-10-23T23:06:45.441Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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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.
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