CVE-2026-58426 Gitea CVE debrief

Who should care

Gitea instance administrators and users with repository access should assess their exposure to this vulnerability, particularly those using Gitea Actions for artifact management across multiple repositories and tasks.

Why it matters

Defenders should prioritize verifying Gitea instances are updated and assess exposure due to the critical vulnerability allowing cross-repository and cross-task interactions.

• Potential unauthorized access to artifacts across repositories
• Possible manipulation of upload-state in cross-task scenarios
• Need for verification of Gitea instance version and exposure to artifact management features
• Prioritization of updating to version 1.26.2 or later

Technical summary

The Gitea Actions Artifacts V4 implementation has a critical vulnerability related to HMAC ambiguity. This issue allows for unauthorized cross-repository artifact read and cross-task upload-state write. The vulnerability has been addressed in Gitea version 1.26.2. The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 9.6 and severity of CRITICAL. Gitea has released a patched version, 1.26.2, addressing the HMAC ambiguity issue. Defenders should prioritize verifying their Gitea instances are updated to version 1.26.2 or later, and assess exposure to artifact uploads and retrievals across repositories and tasks.

Defensive priority

Defenders should prioritize verifying their Gitea instances are updated to version 1.26.2 or later, and assess exposure to artifact uploads and retrievals across repositories and tasks.

Recommended defensive actions

• Verify Gitea instances are updated to version 1.26.2 or later
• Assess exposure to artifact uploads and retrievals across repositories and tasks
• Implement compensating controls for artifact access and upload-state management
• Review relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score of 9.6 and severity of CRITICAL. Gitea has released a patched version, 1.26.2, addressing the HMAC ambiguity issue.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.