Allocation of Resources Without Limits or Throttling in libgit2 - CVE-2026-53585
Published: July 20, 2026
Vulnerability identifier: #VU138485
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-53585
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libgit2.github.com
Affected software:
libgit2
libgit2
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in git_delta_apply() when processing delta object headers in pack data. A remote attacker can supply a specially crafted pack file or malicious repository data to cause a denial of service.
The issue can be triggered through clone, fetch, indexer, or local repository pack processing, and multi-level OFS_DELTA chains can amplify memory consumption significantly.
How to mitigate CVE-2026-53585
Install security update from vendor's website.