{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53585",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-09T19:11:53.484Z",
        "datePublished": "2026-08-20T18:37:44.115Z",
        "dateUpdated": "2026-08-20T18:37:44.115Z"
    },
    "containers": {
        "cna": {
            "title": "libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "lang": "en",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/releases/tag/v1.8.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/releases/tag/v1.8.6"
                },
                {
                    "name": "https://github.com/libgit2/libgit2/releases/tag/v1.9.5",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libgit2/libgit2/releases/tag/v1.9.5"
                }
            ],
            "affected": [
                {
                    "vendor": "libgit2",
                    "product": "libgit2",
                    "versions": [
                        {
                            "version": "< 1.8.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.9.0, < 1.9.5",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-20T18:37:44.115Z"
            },
            "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."
                }
            ],
            "source": {
                "advisory": "GHSA-27m5-gxxh-x79j",
                "discovery": "UNKNOWN"
            }
        }
    }
}