CVE-2026-23991

MEDIUM5.9EPSS 0.04%

go-tuf affected by client DoS via malformed server response

Published: 1/21/2026Modified: 2/4/2026
Also known as:GHSA-846p-jg2w-w324CGA-59j7-6p4f-jqgqCGA-q2cx-3rhg-vp74GO-2026-4348

Description

# Security Disclosure: Client DoS via malformed server response ## Summary If the TUF repository (or any of its mirrors) returns invalid TUF metadata JSON (valid JSON but not well formed TUF metadata), the client will panic _during parsing_, causing a DoS. The panic happens before any signature is validated. This means that a compromised repository/mirror/cache can DoS clients without having access to any signing key. ## Impact Client crashes upon receiving and parsing malformed TUF metadata. This can cause long running services to enter an restart/crash loop. ## Workarounds None currently. ## Affected code The `metadata.checkType` function did not properly type assert the (untrusted) input causing it to panic on malformed data.

Affected packages (3)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1MEDIUM5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References (6)