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CVE-2026-116591VulnerabilityPublished

Red Hat Security Advisory: Red Hat OpenShift distributed tracing platform (Tempo) 3.11.4 release

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 4 Nov 2026, 06:34 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
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 3 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

Apply the official patch by upgrading to klauspost/compress version 1.20.2 or the corresponding fixed Red Hat builds of OpenShift distributed tracing platform (Tempo). Until patched, reject or filter untrusted Zstandard compressed payloads at ingress proxies or restrict decompression endpoints to authenticated, trusted clients. There is no direct configuration-level workaround within the library itself.

Description

A denial of service vulnerability exists in the klauspost compress library's Zstandard (zstd) decompression implementation used by Red Hat OpenShift distributed tracing platform (Tempo). A remote attacker can submit a specially crafted zstd compressed stream that triggers an out-of-bounds read due to an integer handling flaw, causing the application to crash. This vulnerability does not involve data confidentiality or integrity impacts but results in service disruption. The issue is addressed in klauspost/compress version 1.20.2 and corresponding Red Hat builds.

References

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