CVE catalog
CVE-2026-53586
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
- 0.28% · 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, the built-in HTTP transport in src/libgit2/transports/http.c follows an offsite initial redirect, and handle_remote_auth and handle_auth pass transport->owner->url instead of transport->server.url to the credential callback when the redirected host returns 401 Unauthorized. A callback that scopes credentials to the original trusted URL can therefore return GIT_CREDENTIAL_USERPASS_PLAINTEXT credentials that libgit2 stores in transport->server.cred and sends as an Authorization header to the redirected host. An attacker who controls a trusted Git host or an open redirect on that host can disclose HTTP Basic credentials, personal access tokens, or equivalent credentials. 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-2026-53586 | Not reported |
| Ubuntu | libgit2 | deb | 24.04 | 1.7.2+ds-1ubuntu3.1 | Not reported | UBUNTU-CVE-2026-53586 | Not reported |
| Ubuntu | libgit2 | deb | 26.04 | 1.9.1+ds-1ubuntu1.1 | Not reported | UBUNTU-CVE-2026-53586 | 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/07de6a7e438f95ac9a6efd3222a82117e871ed27]
- [https://github.com/libgit2/libgit2/commit/af2b29ad0a74d5bac9751376879ddaf848136d3b]
- [https://github.com/libgit2/libgit2/commit/c1507abc44647b3acd832a33a5b1c8c9f5ba8821]
- [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-2889-x8f6-mc4x]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-53586]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-53586]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-53586]
- [https://security-tracker.debian.org/tracker/CVE-2026-53586]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53586.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)]