Read the docs
TI-2026-40843 Aliases CVE-2026-56657GHSA-4xjf-493q-98p3

Gitea SSH Key Parser Denial of Service

Priority MEDIUM 61CWE-284Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass, Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-284 and CWE-400.

Summary

Gitea SSH Key Parser Denial of Service

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00174 6th percentileScored 2026-11-07
Fix Fixed code.gitea.io/gitea (Go): 1.27.0gitea.dev (Go): 1.27.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
GiteaGitea Open Source Git Serverup to 1.26.4—No fix listedCNA
—code.gitea.io/gitea (Go)before 1.27.01.27.0Patch availableGHSA-4xjf-493q-98p3
—gitea.dev (Go)before 1.27.01.27.0Patch availableGHSA-4xjf-493q-98p3
  • Gitea Open Source Git Server VendorGitea Affected up to 1.26.4 Fixed in — No fix listed CNA
  • code.gitea.io/gitea (Go) Vendor— Affected before 1.27.0 Fixed in 1.27.0 Patch available GHSA-4xjf-493q-98p3
  • gitea.dev (Go) Vendor— Affected before 1.27.0 Fixed in 1.27.0 Patch available GHSA-4xjf-493q-98p3

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:*——Gitea
  • cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:* Versions — — ·Gitea

Remediation

  • Fix · GHSA-4xjf-493q-98p3 code.gitea.io/gitea (Go) Fixed in 1.27.0 Advisory →
  • Fix · GHSA-4xjf-493q-98p3 gitea.dev (Go) Fixed in 1.27.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 1 product
  • OpenShift Pipelines

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56657
  2. 2026-10-03 Alias added: GHSA-4xjf-493q-98p3

References

Advisory 2

Other 5

  • TI-2026-42785 Gitea before 1.27.1 allows remote code execution via the diffpatch API through Git hook installation. KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-42033 Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts CVSS 3.1CRITICAL 9.8
  • TI-2026-40842 Privilege Escalation via Access Token Scope Escalation in API CVSS 3.1CRITICAL 9.8
  • TI-2026-16922 Gitea Docker image trusts spoofable reverse-proxy headers by default CVSS 3.1CRITICAL 9.8
  • TI-2026-42043 Team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting CVSS 3.1CRITICAL 9.1
  • TI-2026-40381 OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes CVSS 3.1CRITICAL 9.1
See all 240 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences