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CVE-2026-58426 is a critical vulnerability in Gitea affecting Actions Artifacts V4 signed URLs. The issue is described as an HMAC ambiguity flaw in the signed URL mechanism, resulting in improper verification of the cryptographic signature. Successful exploitation can allow an attacker to read artifacts across repository boundaries and to write upload-state data across task boundaries, breaking intended isolation between repositories and workflow tasks. Based on the available information, the flaw is remotely exploitable over the network and does not require privileges or user interaction.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.