Vulnerability Description
compress provides various compression algorithms. Prior to 1.20.2, the zstd DecodeAll and streaming decoder paths can panic when a crafted two-block frame reaches huff0.ReadTable with an FSE normalized count of 32768 that readNCount stores in int16 as -32768. The wrapped count allows buildDtable to retain stale fse.Scratch decode-table state from the prior block, and nextFast then derives an out-of-range state and indexes beyond the table instead of returning a decode error. Both blocks are required to preserve and then reuse the stale state, allowing untrusted zstd input to crash an application. This issue is fixed in version 1.20.2.
Related Weaknesses (CWE)
References
- https://github.com/klauspost/compress/commit/7f5d8528720c895a6106f201719f87eb030
- https://github.com/klauspost/compress/releases/tag/v1.20.2
- https://github.com/klauspost/compress/security/advisories/GHSA-fpmh-frq8-7rj8
FAQ
What is CVE-2026-116591?
CVE-2026-116591 is a documented vulnerability. compress provides various compression algorithms. Prior to 1.20.2, the zstd DecodeAll and streaming decoder paths can panic when a crafted two-block frame reaches huff0.ReadTable with an FSE normalize...
How severe is CVE-2026-116591?
CVSS scoring is not yet available for CVE-2026-116591. Check NVD for updates.
Is there a patch for CVE-2026-116591?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.