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CVE-2026-58426 is a critical authorization-bypass vulnerability in Gitea’s Actions Artifacts V4 signed upload and download URL handling. The flaw stems from ambiguous HMAC input construction for signed URLs, where raw concatenated fields are signed in a way that does not unambiguously bind the request context. As a result, a user who can run a Gitea Actions job can rewrite or repurpose signed artifact URLs so that they validate for unintended targets. Successful exploitation can enable cross-repository artifact reads and cross-task upload-state writes. The issue affects artifact access control by failing to securely bind the signature to the full intended artifact identity and request context, including task and repository scoping. The weakness is consistent with improper verification of a cryptographic signature.
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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.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
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.