CVE-2026-58426
CriticalCVSS 9.6Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
The vulnerability in Gitea Actions Artifacts V4 stems from HMAC ambiguity in signed URLs, allowing cross-repository artifact read and cross-task upload-state write.
Risk Assessment
An attacker can access confidential data stored as artifacts in other repositories or manipulate upload state, leading to data integrity and confidentiality breaches.
Recommendation
Immediately update Gitea to a version containing the fix that resolves the HMAC ambiguity in signed URLs and verify artifact access permission configurations.
Other vulnerabilities in Gitea
See all- CVE-2026-60004CriticalActively exploited
Gitea before version 1.27.1 allows remote code execution via the diffpatch API through Git hook installation.
- CVE-2026-58508Critical
Two SSRF vulnerabilities in Gitea migration/mirror (DNS rebinding + missing re-validation).
- CVE-2026-58443Critical
Public-only repository tokens can update private PR head branches.
- CVE-2026-58433Critical
The team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting. This means a user without proper permissions can change repository-team assignments.
- CVE-2026-56750Critical
Theft of the Remember-Me token in Gitea does not invalidate the attacker's session, allowing continued unauthorized access.
- CVE-2026-56654Critical
The vulnerability allows privilege escalation via access token scope escalation in the API.
- CVE-2026-56443Critical
A public-only scope token can bypass restrictions on limited-visibility owners (Repository and Package categories) — residual after CVE-2026-25714 / PR #37118.
- CVE-2026-55982Critical
The OIDC userinfo endpoint returns identity claims without enforcing API token scopes.
- CVE-2026-27780Critical
A vulnerability in Gitea before version 1.26.0 fails to close the connection on bufio.Scanner errors while processing pre-receive hook input, allowing oversized input to bypass branch-protection checks.
- CVE-2026-27771High
A vulnerability in Gitea up to version 1.26.1 is caused by insufficient permission checks for Composer package source links. This can expose private or internal package source information.
Original NVD description (English source)
Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write
Vulnerability data from NVD (NIST) · CISA KEV · EPSS