Medium [CVE-2026-53585] Denial of Service via Unbounded Memory Allocation
This medium-severity Red Hat Linux advisory covers CVE-2026-53585 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8.
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Summary
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.
This can lead to the exhaustion of system memory, resulting in a Denial of Service (DoS). Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux AI (RHEL AI) 3.
Red Hat fixing advisory: RHSA-2026:59361.
- < 1.8.6
- < 1.9.5
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 1.8.6
- 1.9.5
- libgit2-main-1.9.7-1.hum1
- RHSA-2026:59361
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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