CVE-2026-12844

Full vulnerability record from the local CVENow database.

Description

List::SomeUtils::XS versions before 0.59 for Perl have a heap buffer overflow in the pairwise function. pairwise() collects the values returned by the block into a heap buffer sized to the longer input array, then grows the buffer before each copy with a single quadrupling (alloc <<= 2) instead of a loop. A block call that returns more than four times the current allocation in one invocation outgrows that one quadrupling, and the copy writes past the end of the buffer. Any caller of pairwise() whose block returns, for a single pair, more than four times the longer input array's length writes past the buffer and corrupts the heap.

Severity

HIGH

CVSS score

7.5 (v3.1)

Vulnerability status

Deferred

Source identifier

9b29abf9-4ab0-4765-b253-1875cd9b441e

Published

2026-06-25 16:16:33.097000

Last modified

2026-10-25 22:10:00.150000

View original CVE JSON

{
  "id": "CVE-2026-12844",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-06-25T16:16:33.097",
  "lastModified": "2026-10-25T22:10:00.150",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "List::SomeUtils::XS versions before 0.59 for Perl have a heap buffer overflow in the pairwise function.\n\npairwise() collects the values returned by the block into a heap buffer sized to the longer input array, then grows the buffer before each copy with a single quadrupling (alloc <<= 2) instead of a loop. A block call that returns more than four times the current allocation in one invocation outgrows that one quadrupling, and the copy writes past the end of the buffer.\n\nAny caller of pairwise() whose block returns, for a single pair, more than four times the longer input array's length writes past the buffer and corrupts the heap."
    },
    {
      "lang": "es",
      "value": "Las versiones de List::SomeUtils::XS anteriores a 0.59 para Perl tienen un desbordamiento de búfer de montón en la función pairwise.\n\npairwise() recopila los valores devueltos por el bloque en un búfer de montón dimensionado al array de entrada más largo, luego agranda el búfer antes de cada copia con una única cuadruplicación (alloc <menor o igual que 2) en lugar de un bucle. Una llamada de bloque que devuelve más de cuatro veces la asignación actual en una invocación supera esa única cuadruplicación, y la copia escribe más allá del final del búfer.\n\nCualquier llamador de pairwise() cuyo bloque devuelva, para un solo par, más de cuatro veces la longitud del array de entrada más largo, escribe más allá del búfer y corrompe el montón."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "vendor": "DROLSKY",
          "product": "List::SomeUtils::XS",
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "List-SomeUtils-XS",
          "programFiles": [
            "XS.xs"
          ],
          "programRoutines": [
            {
              "name": "List::SomeUtils::XS::pairwise"
            }
          ],
          "repo": "https://github.com/houseabsolute/List-SomeUtils-XS",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.59",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-06-25T18:56:17.755649Z",
          "id": "CVE-2026-12844",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-122"
        },
        {
          "lang": "en",
          "value": "CWE-787"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/houseabsolute/List-SomeUtils-XS/commit/22549f78669b780d6aa338a2d2e49a3dedfffaa6.patch",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "https://metacpan.org/release/DROLSKY/List-SomeUtils-XS-0.59/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/06/25/11",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ]
}