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CVE-2026-63495VulnerabilityPublished 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-2026-63495· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Aug 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 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

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