# CVE-2026-27779: Gitea forwarded-proto handling allows public URL spoofing

> Attackers can spoof canonical URLs in Gitea by injecting malformed forwarded-proto headers, potentially misleading users or bypassing security checks.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Jul 2026
- **Updated:** 6 Jul 2026
- **Also known as:** GHSA-v8f2-2ghq-9whv, GO-2026-6345

## What is CVE-2026-27779?

CVE-2026-27779 is a high-severity vulnerability in Gitea Open Source Git Server, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Gitea versions before 1.25.5 accept malformed or injected forwarded-proto values when detecting public URLs, allowing spoofed canonical URL generation.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-27779?

3 open source packages ship an affected version, including code.gitea.io/gitea.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `code.gitea.io/gitea` | Go | All versions | 1.25.5 |
| `code.gitea.io/gitea` | Go | All versions | 1.25.5 |
| `code.gitea.io/gitea` | Go | All versions | 1.25.5 |

## How do I fix CVE-2026-27779?

Upgrade code.gitea.io/gitea to 1.25.5 or later.

## Is CVE-2026-27779 being exploited?

There is no known exploitation of CVE-2026-27779 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27779 and fix it if it is affected.

What it is: CVE-2026-27779 is a high-severity vulnerability in Gitea Open Source Git Server, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-27779 in the wild and no public exploit code.

Affected packages and fixed versions:
- code.gitea.io/gitea (Go): affected all versions; fixed in 1.25.5
- code.gitea.io/gitea (Go): affected all versions; fixed in 1.25.5
- code.gitea.io/gitea (Go): affected all versions; fixed in 1.25.5

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-2026-27779/ (Markdown: https://insights.sbomify.com/CVE-2026-27779/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27779
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27779
- OSV: https://osv.dev/vulnerability/CVE-2026-27779

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27779/
Summaries are generated and may contain mistakes; the official description above is the record.