CVE-2026-58426 Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write
Attackers can read artifacts from other repositories and modify upload states due to HMAC ambiguity in signed URLs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58426?
CVE-2026-58426 is a critical missing authorization vulnerability in Gitea Open Source Git Server, published on 3 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write
Weakness: CWE-347
Which versions are affected by CVE-2026-58426?
3 open source packages ship an affected version, including code.gitea.io/gitea.
| Package | Affected | Fixed in |
|---|---|---|
code.gitea.io/gitea Go | From 1.22.0 | 1.26.2 |
code.gitea.io/gitea Go | From 1.22.0 | 1.26.2 |
code.gitea.io/gitea Go | From 1.22.0 | 1.26.2 |
How do I fix CVE-2026-58426?
Upgrade code.gitea.io/gitea to 1.26.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-58426 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58426 exists.
Sources
Also known as GHSA-hg5r-vq93-9fv6, GO-2026-6060.