Vulnerability-Lookup

GHSA-5G35-5JRJ-F39P

Vulnerability from github – Published: 2026-07-13 18:30 – Updated: 2026-07-13 21:31

Details

Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack.

S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds.

A template derived from untrusted input can read heap memory past the buffer and return it to the caller.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-57432"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-125"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-13T17:17:55Z",
    "severity": null
  },
  "details": "Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack.\n\nS_measure_struct adds each item\u0027s size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds.\n\nA template derived from untrusted input can read heap memory past the buffer and return it to the caller.",
  "id": "GHSA-5g35-5jrj-f39p",
  "modified": "2026-07-13T21:31:24Z",
  "published": "2026-07-13T18:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-57432"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Perl/perl5/commit/40754edc72dd3e513d758153c0e2f0215897740e.patch"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Perl/perl5/commit/5f7eb6bbbe0510964e3fb1d6bb691e5445913e55.patch"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/13/6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-57432 (GCVE-0-2026-57432)

Vulnerability from cvelistv5 – Published: 2026-07-13 15:38 – Updated: 2026-07-13 19:30

Title

Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack

Summary

Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack. S_measure_struct adds each item's size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds. A template derived from untrusted input can read heap memory past the buffer and return it to the caller.

Severity

No CVSS data available.

CWE

CWE-190 - Integer Overflow or Wraparound
CWE-125 - Out-of-bounds Read

Assigner

CPANSec

References

3 references

URL	Tags
https://github.com/Perl/perl5/commit/5f7eb6bbbe05…	patch
https://github.com/Perl/perl5/commit/40754edc72dd…	patch
http://www.openwall.com/lists/oss-security/2026/07/13/6

Impacted products

1 product

Vendor	Product	Version
SHAY	perl	Affected: 0 , ≤ 5.43.10 (custom)

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JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-13T19:30:46.712Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/13/6"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "perl",
          "product": "perl",
          "programFiles": [
            "pp_pack.c"
          ],
          "programRoutines": [
            {
              "name": "S_measure_struct"
            }
          ],
          "repo": "https://github.com/Perl/perl5",
          "vendor": "SHAY",
          "versions": [
            {
              "lessThanOrEqual": "5.43.10",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack.\n\nS_measure_struct adds each item\u0027s size times its repeat count to a running total with no overflow check, so a large repeat count in a pack or unpack template wraps the signed SSize_t total negative. The @, X, and x position codes then guard their moves with a signed length comparison that passes when the length is negative, advancing the buffer pointer out of bounds.\n\nA template derived from untrusted input can read heap memory past the buffer and return it to the caller."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "CWE-190 Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-13T15:38:20.728Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/Perl/perl5/commit/5f7eb6bbbe0510964e3fb1d6bb691e5445913e55.patch"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/Perl/perl5/commit/40754edc72dd3e513d758153c0e2f0215897740e.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Apply the upstream patches. The fix is included in the Perl 5.43.11 development release."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Perl versions through 5.43.10 have an integer overflow in S_measure_struct leading to an out-of-bounds heap read in pack and unpack",
      "x_generator": {
        "engine": "cpansec-cna-tool 0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-57432",
    "datePublished": "2026-07-13T15:38:20.728Z",
    "dateReserved": "2026-06-24T13:09:26.322Z",
    "dateUpdated": "2026-07-13T19:30:46.712Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-5G35-5JRJ-F39P

CVE-2026-57432 (GCVE-0-2026-57432)

Tags

Sightings

Nomenclature