CVE-2026-58426 Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write

Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write...

CVE-2026-58426

The CVE-2026-58426 affects Gitea, specifically the Actions Artifacts V4 signed URL mechanism, where an HMAC ambiguity enables cross-repository artifact read and cross-task upload-state write. The vulnerability stems from how signed URLs are validated, allowing unauthorized access across repositor...