Description
A flaw was found in libgit2 before version 0.27.3. A missing check in git_delta_apply function in delta.c file, may lead to an out-of-bound read while reading a binary delta file. An attacker may use this flaw to cause a Denial of Service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| libgit2 | libgit2 | before version 0.27.3 | — |
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 | 0.27.4+dfsg.1-0.1 | — |
| Debian 13 | libgit2 | 0.27.4+dfsg.1-0.1 | — |
| Debian 12 | libgit2 | 0.27.4+dfsg.1-0.1 | — |
| Debian 9 | libgit2 | 0.25.1+really0.24.6-1+deb9u1 | DLA-2936-1 |
| Debian 8 | libgit2 | 0.21.1-3+deb8u1 | DLA-1477-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libgit2 | 0.26.0+dfsg.1-1.1ubuntu0.2 | — |
| Ubuntu 16.04 LTS | libgit2 | 0.24.1-2ubuntu0.2 | — |
| Ubuntu 14.04 LTS | libgit2 | 0.19.0-2ubuntu0.4 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | libgit2 | 0.26.6-3.5.2 | SUSE-SU-2018:2469-1 |
| SLES 12 SP3 | libgit2 | 0.24.1-7.6.1 | SUSE-SU-2018:3440-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Manager Server 3.2 | libgit2 | 0.24.1-7.6.1 | SUSE-SU-2018:3440-1 |
| SUSE Manager Server 3.1 | libgit2 | 0.24.1-7.6.1 | SUSE-SU-2018:3440-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.23 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.22 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.21 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.20 | libgit2 | 0.27.3-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.18 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.17 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.16 | libgit2 +1 | 0.27.3-r0 | — |
| Alpine v3.15 | libgit2 +1 | 0.27.3-r0 | — |
| Alpine v3.14 | libgit2 +1 | 0.27.3-r0 | — |
| Alpine v3.13 | libgit2 +1 | 0.27.3-r0 | — |
| Alpine v3.12 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.11 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.10 | libgit2 +1 | 0.27.3-r0 | — |
| Alpine v3.9 | libgit2 | 0.27.3-r0 | — |
| Alpine v3.8 | libgit2 | 0.27.3-r0 | — |
Advisories 4
- DLA-2936-1 libgit2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1477-1 libgit2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:3440-1 Security update for libgit2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:2469-1 Security update for libgit2 SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/libgit2/libgit2/commit/9844d38bed10e9ff17174434b3421b227ae710f3
- [debian-lts-announce] 20180825 [SECURITY] [DLA 1477-1] libgit2 security update mailing-list
- https://github.com/libgit2/libgit2/releases/tag/v0.27.3
- https://bugzilla.redhat.com/show_bug.cgi?id=1598024
- [debian-lts-announce] 20220321 [SECURITY] [DLA 2936-1] libgit2 security update mailing-list