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CVE-2026-66035VulnerabilityPublished Updated

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

Affects Red HatSource GCVE Database

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Not known to be exploited.

Data as of 31 Oct 2026, 20:20 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 Jul 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 31 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat Product Security Red HatAffected
  • =1.11.1-10.3.hum1
Fixed in–

AI-suggested

Red Hat recommends restricting SSH client connections to trusted servers to mitigate the risk. Users should monitor Red Hat advisories for updates and apply patches once available.

Description

A heap buffer overflow vulnerability (CVE-2026-66035) exists in libssh2 used by Red Hat Hardened Images RPMs. A malicious SSH server can exploit this flaw during cipher negotiation to corrupt heap memory on the client side before authentication, potentially leading to arbitrary code execution. Exploitation requires the client to connect to a malicious server, limiting the attack surface. Red Hat has issued an advisory but no official fix has been released yet for the affected packages.

References

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