CVE-2026-27779 json
Gitea forwarded-proto handling allows public URL spoofing
published 4mo ago modified 15d ago also GHSA-v8f2-2ghq-9whv , GO-2026-6345 , EUVD-2026-41637
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
Gitea versions before 1.25.5 accept malformed or injected forwarded-proto values when detecting public URLs, allowing spoofed canonical URL generation.
Patch / fix
- go code.gitea.io/gitea 1.25.5
- Gitea Gitea Open Source Git Server 1.25.5
- govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260916T180043-160000.1.1
suse advisories SUSE-SU-2026:23855-1SUSE-SU-2026:23863-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260916T180043-160000.1.1
opensuse advisories openSUSE-SU-2026:21897-1
- github.com/go-gitea/gitea@723ce35 commit
- github.com/go-gitea/gitea@e2517e0 commit
- github.com/go-gitea/gitea#36810 pull request
- github.com/go-gitea/gitea#36836 pull request
- github.com/go-gitea/gitea/releases/tag/v1.25.5 release
Is CVE-2026-27779 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | code.gitea.io/gitea | <1.25.5 |
1.25.5 |
Affected products
- Gitea Gitea Open Source Git Server
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/go-gitea/gitea/pull/36810
patch, web
-
github.com
/go-gitea/gitea/pull/36836
patch, web
-
github.com
/go-gitea/gitea/commit/723ce3579f96e75fd12514283023a051a1432b1b
web
-
github.com
/go-gitea/gitea/commit/e2517e0fa93177ef6947245eaeab543c95ef18ff
web
-
github.com
/go-gitea/gitea/releases/tag/v1.25.5
release-notes, web
-
blog.gitea.com
/release-of-1.25.5/
release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-27779
advisory
-
blog.gitea.com
/release-of-1.25.5
web
-
github.com
/go-gitea/gitea
package
-
github.com
/advisories/GHSA-v8f2-2ghq-9whv
advisory
Sources
- CVE List CVE-2026-27779
- GitHub Advisory GHSA-v8f2-2ghq-9whv
- NVD CVE-2026-27779
- OSV GO-2026-6345
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.