CVE-2026-53585 - libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header
Brief
CVE ID : CVE-2026-53585
Published : Aug. 20, 2026, 6:37 p. m.
- 31 minutes ago
Description : 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.
- 6 and 1.
- 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.
- 6 and 1.
- 5.