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Advisory record · GHSA-fpmh-frq8-7rj8

compress zstd: Panic on two-block frames

CVSS 8.7 HighEPSS 0.0033 · 26th percentile

Published by the GitHub Advisory Database at 27 Oct 2026, 15:38 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/klauspost/compress/zstdGo<1.20.21.20.2
Identifiers
GHSA-fpmh-frq8-7rj8 · CVE-2026-116591 · GO-2026-6865
Weakness (CWE)
CWE-190
Tags
Published
27 Oct 2026
Updated
5 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Versions of github.com/klauspost/compress/zstd before 1.20.2 can be made to panic when decoding a crafted two-block zstd frame, through DecodeAll or the streaming decoder. An attacker who can supply compressed zstd input to a program that decompresses it can crash that program. Upgrade to version 1.20.2 or later, which fixes the issue.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0033, the 26th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.