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CVE-2026-33630VulnerabilityPublished Updated

Red Hat Security Advisory: c-ares security update

Affects Red Hat c-aresSource GCVE Database

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Not known to be exploited.

Data as of 4 Nov 2026, 11:17 UTC

Severity
High

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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 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 4 Nov 2026.

What to do

AI-suggested

Red Hat has released security updates for Red Hat Enterprise Linux 10 and its extended update support variants to fix this vulnerability. Users should apply the updates provided in Red Hat advisory RHSA-2026:42096. For detailed instructions, refer to Red Hat's update article at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.

Description

A use-after-free and double-free vulnerability (CVE-2026-33630) exists in the c-ares C library's query-completion handling. This library provides asynchronous DNS request functionality and name resolving APIs. Red Hat has issued a security advisory for this vulnerability affecting Red Hat Enterprise Linux 10 and related variants. The vulnerability has been rated as important by Red Hat Product Security. A security update is available to address this issue.

References

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