Reachable Assertion Affecting github.com/theupdateframework/go-tuf/metadata package, versions <2.3.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 Jan 2026
- disclosed22 Jan 2026
- credit1seal
Introduced: 22 Jan 2026
CVE-2026-23991 (opens in a new tab)How to fix?
Upgrade github.com/theupdateframework/go-tuf/metadata to version 2.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Reachable Assertion in the checkType() function. An attacker can cause the client to panic and terminate unexpectedly by providing invalid TUF metadata (which is valid JSON). The vulnerable parsing happens before signature validation, so a compromised repository, mirror, or cache can cause a client crash without a valid signature.