CVE-2026-56657 Gitea SSH Key Parser Denial of Service
Medium 6.2
Published
Updated
Check this codebase for CVE-2026-56657 and fix it if it is affected.
What it is: CVE-2026-56657 is a medium-severity vulnerability in Gitea Open Source Git Server, published on 13 Aug 2026.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56657 exists.
Affected packages and fixed versions:
- gitea.dev (Go): affected all versions; fixed in 1.27.0
- gitea.dev (Go): affected all versions; fixed in 1.27.0
- gitea.dev (Go): affected all versions; fixed in 1.27.0
- code.gitea.io/gitea (Go): affected all versions; fixed in 1.27.0
- code.gitea.io/gitea (Go): affected all versions; fixed in 1.27.0
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-56657/ (Markdown: https://insights.sbomify.com/CVE-2026-56657/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-56657?
CVE-2026-56657 is a medium-severity vulnerability in Gitea Open Source Git Server, published on 13 Aug 2026.
Official description
Gitea SSH Key Parser Denial of Service
Weakness: CWE-284
Which versions are affected by CVE-2026-56657?
5 open source packages ship an affected version, including gitea.dev and code.gitea.io/gitea.
| Package | Affected | Fixed in |
|---|---|---|
gitea.dev Go | All versions | 1.27.0 |
gitea.dev Go | All versions | 1.27.0 |
gitea.dev Go | All versions | 1.27.0 |
code.gitea.io/gitea Go | All versions | 1.27.0 |
code.gitea.io/gitea Go | All versions | 1.27.0 |
How do I fix CVE-2026-56657?
Upgrade gitea.dev to 1.27.0 or later.
Is CVE-2026-56657 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56657 exists.
Sources
Also known as GHSA-4xjf-493q-98p3, GO-2026-6042, MINI-2w3f-f592-993f, MINI-crrj-qppm-2mvg.