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CVE-2026-116591VulnerabilityPublished

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

Affects Red HatSource 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 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 compress to 1.20.2.

Affected software

ProductAffectedFixed in
klauspostcompressAffected
  • <1.20.2
Fixed in
  • 1.20.2

AI-suggested

A fix is available in klauspost/compress version 1.20.2 and corresponding Red Hat builds (e.g., loki3.6-3.6.19-0.3.hum1). Apply the official update from Red Hat Hardened Images RPMs to remediate this vulnerability. Until patched, mitigate risk by rejecting or filtering untrusted Zstandard compressed payloads at ingress proxies or restricting decompression endpoints to authenticated and trusted clients. No direct configuration-level workaround exists within the library itself.

Description

A vulnerability (CVE-2026-116591) was found in the klauspost compress library's Zstandard (zstd) decompression implementation used in Red Hat Hardened Images RPMs. The flaw is an integer handling error in the decompression logic that leads to an out-of-bounds read and an unhandled panic, causing the application to crash and resulting in a denial of service (DoS). This affects applications decompressing untrusted zstd inputs. No direct workaround exists within the library itself, but filtering untrusted inputs or restricting decompression to trusted clients can mitigate risk until patched versions are applied.

References

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