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, verify_server_cert in src/libgit2/streams/openssl.c uses an inverted !!memcmp result in the GEN_IPADD branch when comparing an IP-literal host with a certificate IP SubjectAltName. OpenSSL builds reject matching IP addresses and accept mismatched IP addresses, allowing a network attacker with a CA-trusted certificate containing any IP SubjectAltName to intercept libgit2 connections to IP-literal HTTPS URLs. DNS SubjectAltName validation and non-OpenSSL TLS backends are not affected. This issue is fixed in versions 1.8.6 and 1.9.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| libgit2 | libgit2 | < 1.8.6, >= 1.9.0, < 1.9.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libgit2 | 1.9.6+ds-1 | — |
| Debian 13 | libgit2 | 1.9.0+ds-2+deb13u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | libgit2 | 1.9.1+ds-1ubuntu1.3 | USN-8907-1 |
| Ubuntu 24.04 LTS | libgit2 | 1.7.2+ds-1ubuntu3.3 | USN-8907-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | libgit2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | libgit2 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | libgit2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | libgit2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libgit2 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | libgit2 +1 | 1.9.7-1.hum1 | RHSA-2026:59361 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libgit2 | 1.9.6-1.1 | openSUSE-SU-2026:11315-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libgit2 | 1.9.6-r0 | — |
| Alpine v3.23 | libgit2 | 1.9.6-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | libgit2 +1 | 1.6.4-116.amzn2023 | ALAS2023-2026-2083 |
| Amazon Linux 2023 | rust +14 | 1.97.0-2.amzn2023 | ALAS2023-2026-2065 |
| Amazon Linux 2 | rust +11 | 1.97.0-2.amzn2 | ALAS2-2026-3865 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | libgit2 | 1.7.2-3 | — |
Advisories 6
- USN-8907-1 libgit2 vulnerability Ubuntu Security Notices (USN) · Oct 9, 2026
- RHSA-2026:59361 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- ALAS2023-2026-2083 Important: libgit2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- ALAS2-2026-3865 Important: rust security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 17, 2026
- ALAS2023-2026-2065 Important: rust security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 17, 2026
- openSUSE-SU-2026:11315-1 libgit2-1_9-1.9.6-1.1 on GA media SUSE / openSUSE Security Updates · Jul 21, 2026
References
- https://github.com/libgit2/libgit2/security/advisories/GHSA-h7gc-w2gg-p9xp
- https://github.com/libgit2/libgit2/commit/647dcb432980b84ede4cb5a008bbd1ccb4ead03d
- https://github.com/libgit2/libgit2/commit/c2aa35409ee0e6515df64da49750f13a0a42c47f
- https://github.com/libgit2/libgit2/commit/ef086bc3e4eedf62be38a910381aae24d49871ff
- https://github.com/libgit2/libgit2/releases/tag/v1.8.6
- https://github.com/libgit2/libgit2/releases/tag/v1.9.5