CVE-2026-53585— libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header
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I. Basic Information for CVE-2026-53585
Vulnerability Information
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Vulnerability Title
libgit2: Unbounded Memory Allocation via Delta Object Result-Size Header
Source: CVE Program / CVE List V5
Vulnerability 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 1.8.6 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-53585
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Patches & Fixes for CVE-2026-53585 (4)
Vendor Advisories for CVE-2026-53585 (1)
Vendor Pages for CVE-2026-53585 (1)
Same Patch Batch · libgit2 · 2026-08-20 · 5 CVEs total
| CVE-2026-53587 | 7.5 HIGH | libgit2 - Unauthenticated network-reachable heap out-of-bounds read in transports/smart_pk |
| CVE-2026-53586 | 6.5 MEDIUM | libgit2: HTTP transport can leak credentials to an offsite redirect target |
| CVE-2026-53583 | 6.5 MEDIUM | libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Backend |
| CVE-2026-53584 | 4.3 MEDIUM | libgit2: Submodule path traversal |
IV. Related Vulnerabilities
Same product: libgit2
- CVE-2026-53586
libgit2: HTTP transport can leak credentials to an offsite r - CVE-2026-53583
libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Ba - CVE-2026-53587
libgit2 - Unauthenticated network-reachable heap out-of-boun - CVE-2026-53584
libgit2: Submodule path traversal - CVE-2026-5917
libgit2 v0.27.0-v1.9.0 Shell Command Injection via ssh_libss
Same vendor: libgit2
- CVE-2026-53586
libgit2: HTTP transport can leak credentials to an offsite r - CVE-2026-53583
libgit2: Inverted IP SubjectAltName Comparison in OpenSSL Ba - CVE-2026-53587
libgit2 - Unauthenticated network-reachable heap out-of-boun - CVE-2026-53584
libgit2: Submodule path traversal - CVE-2026-5917
libgit2 v0.27.0-v1.9.0 Shell Command Injection via ssh_libss
Same weakness: CWE-770
- CVE-2026-59279
Unbounded persistent session allocation via repeated initial - CVE-2026-54389
Ghidra < 12.1.3 PDB Parser Uncontrolled Heap Growth DoS via - CVE-2026-17170
Vulnerabilities in IBM AIX and PowerVM VIOS - CVE-2026-17163
Vulnerabilities in IBM AIX and PowerVM VIOS - CVE-2026-67447
Mailpit: SMTP DATA line reader buffers over-limit input befo
V. Comments for CVE-2026-53585
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