Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Affects Red HatSource GCVE Database
Not known to be exploited.
Data as of 31 Oct 2026, 20:20 UTC
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
Disclosed: evidence found.
CVE published 27 Jul 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 31 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Product Security Red Hat | Affected
| 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
- access.redhat.com/errata/RHSA-2026:46955 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-66035 (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_46955.json (opens in a new tab)
- ubuntu.com/security/CVE-2026-66035 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-66035 (opens in a new tab)
- github.com/libssh2/libssh2/pull/2198 (opens in a new tab)
- vulncheck.com/advisories/libssh2-heap-buffer-overflow-via-etm-cipher-negotiation (opens in a new tab)