CVE catalog
CVE-2026-53585
libgit2 vulnerabilities
- Severity
- High · CVSS 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.40% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libgit2 | sid | 1.9.7+ds-1 | fixed |
| Debian | libgit2 | forky | 1.9.7+ds-1 | fixed |
| Debian | libgit2 | trixie | 1.9.0+ds-2+deb13u1 | fixed |
| Debian | libgit2 | trixie-security | 1.9.0+ds-2+deb13u1 | fixed |
| Debian | libgit2 | bookworm | 1.5.1+ds-1+deb12u1 | vulnerable |
| Debian | libgit2 | bookworm-security | 1.5.1+ds-1+deb12u2 | fixed |
| Ubuntu | libgit2 | noble | 1.7.2+ds-1ubuntu3.1 | fixed |
| Ubuntu | libgit2-1.7 | noble | 1.7.2+ds-1ubuntu3.1 | fixed |
| Ubuntu | libgit2-dev | noble | 1.7.2+ds-1ubuntu3.1 | fixed |
| Ubuntu | libgit2-fixtures | noble | 1.7.2+ds-1ubuntu3.1 | fixed |
| Ubuntu | libgit2 | pro | 1.1.0+dfsg.1-4 | vulnerable |
| Ubuntu | libgit2 | pro | 1.1.0+dfsg.1-4.1 | vulnerable |
| Ubuntu | libgit2 | pro | 1.1.0+dfsg.1-4.1build1 | vulnerable |
| Ubuntu | libgit2 | pro | 1.1.0+dfsg.1-4.1ubuntu0.1 | vulnerable |
| Ubuntu | libgit2 | pro | 1.1.0+dfsg.1-4.1ubuntu0.1+esm1 | fixed |
| Ubuntu | libgit2 | 24.04 | 1.5.1+ds-1ubuntu1 | vulnerable |
| Ubuntu | libgit2 | 24.04 | 1.7.1+ds-2ubuntu1 | vulnerable |
| Ubuntu | libgit2 | 24.04 | 1.7.2+ds-1ubuntu1 | vulnerable |
| Ubuntu | libgit2 | 24.04 | 1.7.2+ds-1ubuntu2 | vulnerable |
| Ubuntu | libgit2 | 24.04 | 1.7.2+ds-1ubuntu3 | vulnerable |
| Ubuntu | libgit2 | 24.04 | 1.7.2+ds-1ubuntu3.1 | fixed |
| Ubuntu | libgit2 | 26.04 | 1.9.0+ds-2ubuntu2 | vulnerable |
| Ubuntu | libgit2 | 26.04 | 1.9.1+ds-1ubuntu1 | vulnerable |
| Ubuntu | libgit2 | 26.04 | 1.9.1+ds-1ubuntu1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libgit2 | source | sid | 1.9.6+ds-1 | not yet assigned | Not reported | Not reported |
| Debian | libgit2 | source | forky | 1.9.6+ds-1 | not yet assigned | Not reported | Not reported |
| Debian | libgit2 | source | trixie | 1.9.0+ds-2+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | libgit2 | source | bookworm | 1.5.1+ds-1+deb12u2 | not yet assigned | Not reported | Not reported |
| Ubuntu | libgit2 | deb | noble | 1.7.2+ds-1ubuntu3.1 | Not reported | Not reported | Not reported |
| Ubuntu | libgit2-1.7 | deb | noble | 1.7.2+ds-1ubuntu3.1 | Not reported | Not reported | Not reported |
| Ubuntu | libgit2-dev | deb | noble | 1.7.2+ds-1ubuntu3.1 | Not reported | Not reported | Not reported |
| Ubuntu | libgit2-fixtures | deb | noble | 1.7.2+ds-1ubuntu3.1 | Not reported | Not reported | Not reported |
| Ubuntu | libgit2 | deb | pro | 1.1.0+dfsg.1-4.1ubuntu0.1+esm1 | Not reported | UBUNTU-CVE-2026-53585 | Not reported |
| Ubuntu | libgit2 | deb | 24.04 | 1.7.2+ds-1ubuntu3.1 | Not reported | UBUNTU-CVE-2026-53585 | Not reported |
| Ubuntu | libgit2 | deb | 26.04 | 1.9.1+ds-1ubuntu1.1 | Not reported | UBUNTU-CVE-2026-53585 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libgit2-1.5]Affected
Source package: [libgit2]
Details (4)
1.5.1+ds-1+deb12u1· amd64 · bookwormAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· arm64 · bookwormAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· amd64 · bookworm-securityAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· arm64 · bookworm-securityAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
- [libgit2-dev]Affected
Source package: [libgit2]
Details (6)
1.5.1+ds-1+deb12u1· amd64 · bookwormAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· arm64 · bookwormAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.8.4+ds-3~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.8.4+ds-3~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· amd64 · bookworm-securityAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· arm64 · bookworm-securityAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
- [libgit2-fixtures]Affected
Source package: [libgit2]
Details (6)
1.5.1+ds-1+deb12u1· all · bookwormAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· all · bookwormAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.8.4+ds-3~bpo12+1· all · bookworm-backportsFixed · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.8.4+ds-3~bpo12+1· all · bookworm-backportsFixed · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· all · bookworm-securityAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.5.1+ds-1+deb12u1· all · bookworm-securityAffected · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
- [libgit2-1.8]Fixed
Source package: [libgit2]
Details (2)
1.8.4+ds-3~bpo12+1· amd64 · bookworm-backportsFixed · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
1.8.4+ds-3~bpo12+1· arm64 · bookworm-backportsFixed · Fixed:
1.5.1+ds-1+deb12u2usn · libgit2 · debian · bookworm; usn · libgit2 · debian · 12
[Debian 13 (Trixie)]
- [libgit2-1.9]Affected
Source package: [libgit2]
Details (4)
1.9.0+ds-2· amd64 · trixieAffected · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2· arm64 · trixieAffected · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2+deb13u1· arm64 · trixie-securityFixed · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
- [libgit2-dev]Affected
Source package: [libgit2]
Details (4)
1.9.0+ds-2· amd64 · trixieAffected · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2· arm64 · trixieAffected · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2+deb13u1· arm64 · trixie-securityFixed · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
- [libgit2-fixtures]Affected
Source package: [libgit2]
Details (4)
1.9.0+ds-2· all · trixieAffected · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2· all · trixieAffected · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2+deb13u1· all · trixie-securityFixed · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
1.9.0+ds-2+deb13u1· all · trixie-securityFixed · Fixed:
1.9.0+ds-2+deb13u1usn · libgit2 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11315-1.json]
- [https://github.com/libgit2/libgit2/commit/0cdfdd5fa8f8514c82413025e1e0808866cf7c30]
- [https://github.com/libgit2/libgit2/commit/c1896f06df22cc0ca5658df3a8f6cd7ede4cd6ae]
- [https://github.com/libgit2/libgit2/commit/dec22ac01ad9620c96b7b9ac3ef636ea46d43bed]
- [https://github.com/libgit2/libgit2/releases/tag/v1.8.6]
- [https://github.com/libgit2/libgit2/releases/tag/v1.9.5]
- [https://github.com/libgit2/libgit2/security/advisories/GHSA-27m5-gxxh-x79j]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-53585]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-53585]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-53585]
- [https://security-tracker.debian.org/tracker/CVE-2026-53585]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53585.json]
- [https://ubuntu.com/security/notices/USN-8628-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]