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CVE-2026-43964VulnerabilityPublished Updated

Red Hat Security Advisory: postfix security update

Affects Red Hat postfixSource GCVE Database

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Not known to be exploited.

Data as of 6 Nov 2026, 02:20 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 19 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 5 Nov 2026.

What to do

AI-suggested

Red Hat has released patched postfix packages (version 2.10.1-9.el7_9.1) for Red Hat Enterprise Linux Server Extended Life Cycle Support 7. Users should apply these updates promptly to remediate the vulnerability. For detailed update instructions, refer to the Red Hat article at https://access.redhat.com/articles/11258. No additional mitigation steps are specified or required beyond applying the official update.

Description

A security update for the postfix Mail Transport Agent addresses a buffer over-read vulnerability caused by a malformed enhanced status code (CVE-2026-43964). This issue affects Red Hat Enterprise Linux Server Extended Life Cycle Support 7 across multiple architectures. The vulnerability is rated as having an important security impact by Red Hat Product Security.

References

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