Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Affects Red HatSource GCVE Database
Not known to be exploited · CVSS 8.7 High : upgrade Red Hat to 1.20.2 soon.
Data as of 30 Oct 2026, 01:48 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 4.0 | 8.7 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 29 Oct 2026.
What to do
Upgrade compress to 1.20.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| klauspostcompress | Affected
| Fixed in
|
AI-suggested
Apply the updated tempo3.0 RPM version 3.0.4-0.3.hum1 provided by Red Hat Hardened Images. Additionally, 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) was found in the klauspost compress library's Zstandard (zstd) decompression implementation used in Red Hat Hardened Images. The flaw is an integer handling error that leads to an out-of-bounds read and an unhandled panic, causing a denial of service (DoS) when processing specially crafted compressed streams. The issue affects tempo3.0 RPMs updated to version 3.0.4-0.3.hum1. No direct workaround exists within the library; mitigation involves rejecting or filtering untrusted compressed payloads or restricting decompression to trusted clients.
References
- access.redhat.com/errata/RHSA-2026:91459 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-116591 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- images.redhat.com (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_91459.json (opens in a new tab)