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CVE-2026-116591VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Affects Red Hat compressSource GCVE Database

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Authoritative record:CVE-2026-116591· High 8.7

Not known to be exploited · CVSS 8.7 High : upgrade Red Hat compress to 1.20.2 soon.

Data as of 6 Nov 2026, 11:23 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 4.08.7
EPSS
0.3% chance of exploitation in 30 days – higher than 26% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.20.2
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade github.com/klauspost/compress to 1.20.2.

Affected software

ProductAffectedFixed in
Gogithub.com/klauspost/compresspkg:golang/github.com/klauspost/compressOther threatsAffected
  • <1.20.2
Fixed in
  • 1.20.2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fixed version of the klauspost compress library (version 1.20.2 or later) is available and included in updated Red Hat Hardened Images RPMs (tempo2.10-2.10.9-0.2.hum1). Applying this update fully remediates the vulnerability. If you cannot patch yet, mitigate by rejecting or filtering untrusted Zstandard compressed payloads at ingress proxies or restricting decompression endpoints to authenticated, trusted clients. No direct configuration-level workaround exists within the library itself. Applying the official patch is the recommended remediation.

Description

A vulnerability (CVE-2026-116591) in the klauspost compress library's Zstandard (zstd) decompression implementation allows a remote attacker to cause a denial of service (DoS) by submitting a specially crafted compressed stream. The flaw is due to an integer handling error that leads to an out-of-bounds read and an unhandled panic, crashing the application. This affects applications decompressing untrusted zstd input using the vulnerable library. The impact is isolated by container boundaries and non-root execution. Mitigations include rejecting or filtering untrusted zstd payloads or restricting decompression to trusted clients. A fixed version of the library (klauspost/compress 1.20.2+) is available and included in updated Red Hat Hardened Images RPMs.

References

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