CVE-2026-53585

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{"affected": [{"affectedData": [{"product": "libgit2", "vendor": "libgit2", "versions": [{"status": "affected", "version": "< 1.8.6"}, {"status": "affected", "version": ">= 1.9.0, < 1.9.5"}]}], "source": "security-advisories@github.com"}], "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 implementaci\u00f3n port\u00e1til en C de los m\u00e9todos centrales de Git, proporcionada como una biblioteca enlazable con una API s\u00f3lida, que permite integrar la funcionalidad de Git en su aplicaci\u00f3n. Antes de las versiones 1.8.6 y 1.9.5, git_delta_apply en src/libgit2/delta.c conf\u00eda 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 trav\u00e9s 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 peque\u00f1a para retener asignaciones extremadamente grandes y agotar la memoria. Este problema est\u00e1 corregido en las versiones 1.8.6 y 1.9.5."}], "id": "CVE-2026-53585", "lastModified": "2026-10-26T10:10:00.140", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53585", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-25T15:21:18.543141Z", "version": "2.0.3"}}]}, "published": "2026-08-20T19:16:54.837", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30"}, {"source": "security-advisories@github.com", "url": "https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae"}, {"source": "security-advisories@github.com", "url": "https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed"}, {"source": "security-advisories@github.com", "url": "https://github.com/libgit2/libgit2/releases/tag/v1.8.6"}, {"source": "security-advisories@github.com", "url": "https://github.com/libgit2/libgit2/releases/tag/v1.9.5"}, {"source": "security-advisories@github.com", "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "libgit2: libgit2: Denial of Service via Unbounded Memory Allocation", "id": "2520696", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520696"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["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.", "A flaw was found in libgit2. The `git_delta_apply` function incorrectly trusts an attacker-controlled size value from a delta object header, which is used for memory allocation before proper validation of delta instructions. A remote attacker or local user can supply malicious pack data, for example, through `git_clone` or `git_fetch`, to trigger extremely large memory allocations. This can lead to the exhaustion of system memory, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid cloning or fetching from untrusted Git repositories. Restricting access to systems that perform Git operations on untrusted data can also reduce exposure."}, "name": "CVE-2026-53585", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "rust", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libgit2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "rust", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "libgit2", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Fix deferred", "package_name": "rust", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "libgit2", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-08-20T18:37:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53585\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53585\nhttps://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30\nhttps://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae\nhttps://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed\nhttps://github.com/libgit2/libgit2/releases/tag/v1.8.6\nhttps://github.com/libgit2/libgit2/releases/tag/v1.9.5\nhttps://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.8.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.9.0,1.9.5)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "libgit2", "source": "cna", "vendor": "libgit2"}, "product": "libgit2", "vendor": "libgit2"}], "created": "2026-08-20T20:30:05.364261+00:00", "updated": "2026-08-21T01:30:05.844166+00:00", "vendors": ["libgit2", "libgit2$PRODUCT$libgit2"]}