CVE-2026-53585

{
  "id": "CVE-2026-53585",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-20T19:16:54.837",
  "lastModified": "2026-10-26T10:10:00.140",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, git_delta_apply in src/libgit2/delta.c trusts the attacker-controlled res_sz value parsed by hdr_sz from a delta object header and passes that amount to git__malloc before validating delta instructions. Malicious pack data supplied through git_clone, git_fetch, git_remote_fetch, git_indexer_append, or a local attacker-supplied repository can use a very small multi-level OFS_DELTA chain to retain extremely large allocations and exhaust memory. This issue is fixed in versions 1.8.6 and 1.9.5."
    },
    {
      "lang": "es",
      "value": "libgit2 es una implementación portátil en C de los métodos centrales de Git, proporcionada como una biblioteca enlazable con una API sólida, que permite integrar la funcionalidad de Git en su aplicación. Antes de las versiones 1.8.6 y 1.9.5, git_delta_apply en src/libgit2/delta.c confía en el valor res_sz controlado por el atacante, analizado por hdr_sz desde una cabecera de objeto delta, y pasa esa cantidad a git__malloc antes de validar las instrucciones delta. Datos de paquete maliciosos suministrados a través de git_clone, git_fetch, git_remote_fetch, git_indexer_append, o un repositorio suministrado por un atacante local, pueden usar una cadena OFS_DELTA multinivel muy pequeña para retener asignaciones extremadamente grandes y agotar la memoria. Este problema está corregido en las versiones 1.8.6 y 1.9.5."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "libgit2",
          "product": "libgit2",
          "versions": [
            {
              "version": "< 1.8.6",
              "status": "affected"
            },
            {
              "version": ">= 1.9.0, < 1.9.5",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "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:L",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "LOW"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-25T15:21:18.543141Z",
          "id": "CVE-2026-53585",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libgit2/libgit2/releases/tag/v1.8.6",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libgit2/libgit2/releases/tag/v1.9.5",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}