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CVE-2026-116591VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement 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 13 Nov 2026, 14:33 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 13 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

Red Hat has released updated RPMs (opentelemetry-collector-0.164.0-0.1.hum1) that fix this vulnerability. Users should apply these updates to remediate the issue. If you cannot patch yet, it is recommended to reject or filter untrusted Zstandard-compressed payloads at ingress proxies or restrict decompression endpoints to authenticated, trusted clients. No direct configuration-level workaround exists within the library itself.

Description

A vulnerability (CVE-2026-116591) exists 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 causes an out-of-bounds read, leading to an unhandled panic and application crash (Denial of Service). The issue affects applications decompressing untrusted zstd input streams. Mitigation involves applying the updated RPMs or filtering untrusted compressed payloads at ingress points.

References

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