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Advisory record · GHSA-hg5r-vq93-9fv6

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

CVSS 9.6 CriticalCriticalEPSS 0.0023 · 14th percentile

Critical, because:

  • CVSS score 9.6: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 21 Jul 2026, 20:36 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
code.gitea.io/giteaGo>=1.22.0, <1.26.21.26.2
Identifiers
GHSA-hg5r-vq93-9fv6 · CVE-2026-58426 · GO-2026-6060
Weakness (CWE)
CWE-347
Tags
Published
21 Jul 2026
Updated
27 Jul 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Gitea versions from 1.22.0 before 1.26.2 are affected. The Actions Artifacts V4 signed URL scheme concatenates fields without delimiters, so a rewritten URL can reach a different task's artifacts, enabling cross-repository read of private artifacts and writes into another task's upload staging. An attacker who can run a Gitea Actions job, and who knows or can predict the target task ID and artifact name while the target task is running, can carry this out. Upgrade to Gitea 1.26.2. No workaround is listed.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.6 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N CNA (Gitea)
  • CISA KEV Not listed.
  • EPSS 0.0023, the 14th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:55 UTC First seen by agentprime
  2. 31 Oct 2026, 14:55 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.