FKIE_CVE-2026-57432

Vulnerability from fkie_nvd - Published: 2026-07-13 17:17 - Updated: 2026-10-24 22:10
Severity
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 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.
References
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/Perl/perl5/commit/40754edc72dd3e513d758153c0e2f0215897740e.patchPatch
9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/Perl/perl5/commit/5f7eb6bbbe0510964e3fb1d6bb691e5445913e55.patchPatch
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2026/07/13/6Mailing List, Patch, Third Party Advisory
Impacted products
Vendor Product Version
perl perl *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "modules": [
            "perl"
          ],
          "packageName": "perl",
          "packageURL": "pkg:cpan/perl",
          "programFiles": [
            "pp_pack.c"
          ],
          "programRoutines": [
            {
              "name": "S_measure_struct"
            }
          ],
          "repo": "https://github.com/Perl/perl5",
          "versions": [
            {
              "lessThan": "5.40.5-RC1",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "lessThan": "5.42.3-RC1",
              "status": "affected",
              "version": "5.41.0",
              "versionType": "custom"
            },
            {
              "lessThan": "5.43.11",
              "status": "affected",
              "version": "5.43.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:perl:perl:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "8122F8D4-DD5A-4167-AB6A-BA1323CC4349",
              "versionEndIncluding": "5.43.10",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Perl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 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."
    },
    {
      "lang": "es",
      "value": "Las versiones de Perl hasta la 5.43.10 tienen un desbordamiento de entero en S_measure_struct que conduce a una lectura de pila fuera de l\u00edmites en pack y unpack.\n\nS_measure_struct suma el tama\u00f1o de cada elemento multiplicado por su recuento de repeticiones a un total acumulado sin verificaci\u00f3n de desbordamiento, por lo que un recuento de repeticiones grande en una plantilla de pack o unpack envuelve el total SSize_t con signo a negativo. Los c\u00f3digos de posici\u00f3n @, X y x luego protegen sus movimientos con una comparaci\u00f3n de longitud con signo que pasa cuando la longitud es negativa, avanzando el puntero del b\u00fafer fuera de l\u00edmites.\n\nUna plantilla derivada de entrada no confiable puede leer memoria de pila m\u00e1s all\u00e1 del b\u00fafer y devolverla al llamador."
    }
  ],
  "id": "CVE-2026-57432",
  "lastModified": "2026-10-24T22:10:00.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.4,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-57432",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-14T13:34:38.894921Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-13T17:17:55.670",
  "references": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/Perl/perl5/commit/40754edc72dd3e513d758153c0e2f0215897740e.patch"
    },
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/Perl/perl5/commit/5f7eb6bbbe0510964e3fb1d6bb691e5445913e55.patch"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/07/13/6"
    }
  ],
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        },
        {
          "lang": "en",
          "value": "CWE-190"
        }
      ],
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary"
    }
  ]
}



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