Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Affects Red HatSource GCVE Database
Not known to be exploited · CVSS 7.5 High.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitation evidence
Disclosed: evidence found.
CVE published 20 Aug 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 30 Oct 2026.
What to do
AI-suggested
Red Hat advises disabling any services exposing the libevent WebSocket server if its functionality is not required. If the service is necessary, restrict network access to trusted clients or networks using firewall rules. Users should monitor Red Hat advisories for updates.
Description
CVE-2026-63495 is a remote denial of service vulnerability in the libevent WebSocket server component. An unauthenticated attacker can exploit this flaw by sending fragmented WebSocket frames repeatedly, causing unbounded memory accumulation. This leads to memory exhaustion and potential service unavailability. The vulnerability affects Red Hat Hardened Images using libevent. Mitigations include disabling the libevent WebSocket server if not needed or restricting network access to trusted clients. No fixed versions are explicitly stated in the advisory.
References
- access.redhat.com/errata/RHSA-2026:41176 (opens in a new tab)
- images.redhat.com (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-63495 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_41176.json (opens in a new tab)