Vulnerability-Lookup

GHSA-PFMW-49C5-8VV3

Vulnerability from github – Published: 2026-09-30 18:33 – Updated: 2026-09-30 18:33

Details

Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified.

The matches, first_match and match_details methods use the T_STD_STRING typemap to translate Perl scalars (SVs) into strings via the std::string constructor, using the SvPV macro to stringify the haystack input, and the SvCUR macro to determine the length of the SV.

When the input SVs are references, integers (IVs) or floats (NVs), the SvCUR macro will return an invalid length if it is run before the input is stringified, leading to an out-of-bounds read which can abort the process.

Note that the evaluation order of arguments to std::string is unspecified. Depending on the compiler, SvCUR may be run first and lead to an abort that cannot be caught within Perl.

This can be triggered when the haystack is a numeric value, for example,

my $ac = Algorithm::AhoCorasick::XS->new( [ "11", "22" ] );
$ac->matches( 211 );

This can occur when the haystack is the result of reading data from decoded JSON or a numeric database column. It can also be triggered when using a blessed object as a haystack.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80490"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-30T16:19:10Z",
    "severity": null
  },
  "details": "Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified.\n\nThe matches, first_match and match_details methods use the T_STD_STRING typemap to translate Perl scalars (SVs) into strings via the std::string constructor, using the SvPV macro to stringify the haystack input, and the SvCUR macro to determine the length of the SV.\n\nWhen the input SVs are references, integers (IVs) or floats (NVs), the SvCUR macro will return an invalid length if it is run before the input is stringified, leading to an out-of-bounds read which can abort the process.\n\nNote that the evaluation order of arguments to std::string is unspecified. Depending on the compiler, SvCUR may be run first and lead to an abort that cannot be caught within Perl.\n\nThis can be triggered when the haystack is a numeric value, for example,\n\n    my $ac = Algorithm::AhoCorasick::XS-\u003enew( [ \"11\", \"22\" ] );\n    $ac-\u003ematches( 211 );\n\nThis can occur when the haystack is the result of reading data from decoded JSON or a numeric database column. It can also be triggered when using a blessed object as a haystack.",
  "id": "GHSA-pfmw-49c5-8vv3",
  "modified": "2026-09-30T18:33:49Z",
  "published": "2026-09-30T18:33:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80490"
    },
    {
      "type": "WEB",
      "url": "https://github.com/richardjharris/Algorithm-AhoCorasick-XS/pull/1"
    },
    {
      "type": "WEB",
      "url": "https://metacpan.org/release/RJH/Algorithm-AhoCorasick-XS-0.04/source/typemap#L14"
    },
    {
      "type": "WEB",
      "url": "https://rt.cpan.org/Ticket/Display.html?id=181560"
    },
    {
      "type": "WEB",
      "url": "https://security.metacpan.org/patches/A/Algorithm-AhoCorasick-XS/0.04/CVE-2026-80490-r1.patch"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/30/15"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80490 (GCVE-0-2026-80490)

Vulnerability from cvelistv5 – Published: 2026-09-30 15:20 – Updated: 2026-09-30 17:07

Title

Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified

Summary

Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified. The matches, first_match and match_details methods use the T_STD_STRING typemap to translate Perl scalars (SVs) into strings via the std::string constructor, using the SvPV macro to stringify the haystack input, and the SvCUR macro to determine the length of the SV. When the input SVs are references, integers (IVs) or floats (NVs), the SvCUR macro will return an invalid length if it is run before the input is stringified, leading to an out-of-bounds read which can abort the process. Note that the evaluation order of arguments to std::string is unspecified. Depending on the compiler, SvCUR may be run first and lead to an abort that cannot be caught within Perl. This can be triggered when the haystack is a numeric value, for example, my $ac = Algorithm::AhoCorasick::XS->new( [ "11", "22" ] ); $ac->matches( 211 ); This can occur when the haystack is the result of reading data from decoded JSON or a numeric database column. It can also be triggered when using a blessed object as a haystack.

Severity

No CVSS data available.

CWE

CWE-125 - Out-of-bounds Read

Assigner

CPANSec redhat root Scorecard

References

5 references

URL	Tags
https://rt.cpan.org/Ticket/Display.html?id=181560	vendor-advisoryissue-tracking
https://metacpan.org/release/RJH/Algorithm-AhoCor…
https://github.com/richardjharris/Algorithm-AhoCo…	issue-tracking
https://security.metacpan.org/patches/A/Algorithm…	patch
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
		Affected: 0 , ≤ 0.04 (custom)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-30T17:07:30.931Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/30/15"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "Algorithm::AhoCorasick::XS"
          ],
          "packageName": "Algorithm-AhoCorasick-XS",
          "packageURL": "pkg:cpan/Algorithm-AhoCorasick-XS",
          "programFiles": [
            "typemap"
          ],
          "programRoutines": [
            {
              "name": "Algorithm::AhoCorasick::XS::first_match"
            },
            {
              "name": "Algorithm::AhoCorasick::XS::matches"
            },
            {
              "name": "Algorithm::AhoCorasick::XS::match_details"
            }
          ],
          "repo": "https://github.com/richardjharris/Algorithm-AhoCorasick-XS",
          "versions": [
            {
              "lessThanOrEqual": "0.04",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified.\n\nThe matches, first_match and match_details methods use the T_STD_STRING typemap to translate Perl scalars (SVs) into strings via the std::string constructor, using the SvPV macro to stringify the haystack input, and the SvCUR macro to determine the length of the SV.\n\nWhen the input SVs are references, integers (IVs) or floats (NVs), the SvCUR macro will return an invalid length if it is run before the input is stringified, leading to an out-of-bounds read which can abort the process.\n\nNote that the evaluation order of arguments to std::string is unspecified. Depending on the compiler, SvCUR may be run first and lead to an abort that cannot be caught within Perl.\n\nThis can be triggered when the haystack is a numeric value, for example,\n\n    my $ac = Algorithm::AhoCorasick::XS-\u003enew( [ \"11\", \"22\" ] );\n    $ac-\u003ematches( 211 );\n\nThis can occur when the haystack is the result of reading data from decoded JSON or a numeric database column. It can also be triggered when using a blessed object as a haystack."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-30T15:20:45.601Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory",
            "issue-tracking"
          ],
          "url": "https://rt.cpan.org/Ticket/Display.html?id=181560"
        },
        {
          "url": "https://metacpan.org/release/RJH/Algorithm-AhoCorasick-XS-0.04/source/typemap#L14"
        },
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/richardjharris/Algorithm-AhoCorasick-XS/pull/1"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://security.metacpan.org/patches/A/Algorithm-AhoCorasick-XS/0.04/CVE-2026-80490-r1.patch"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Algorithm::AhoCorasick::XS versions through 0.04 for Perl read the haystack string length before the scalar is stringified",
      "workarounds": [
        {
          "lang": "en",
          "value": "No fixed release is available. Apply the patch or the change in the linked pull request.\n\nFor deployments that cannot apply the patch, ensure that all input passed to the matching functions is stringified, for example\n\n    $ac-\u003ematches( \"$input\" );"
        }
      ],
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-80490",
    "datePublished": "2026-09-30T15:20:45.601Z",
    "dateReserved": "2026-08-26T13:32:56.300Z",
    "dateUpdated": "2026-09-30T17:07:30.931Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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GHSA-PFMW-49C5-8VV3

CVE-2026-80490 (GCVE-0-2026-80490)

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