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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 · No CVSS score from NVD or the CNA

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 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 an official security update for postfix (version 3.5.8-4.el8_8.1) that addresses this buffer over-read vulnerability. Users of affected Red Hat Enterprise Linux 8.8 variants should apply this update promptly following Red Hat's guidance at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated or required beyond applying the official patch.

Description

A security vulnerability (CVE-2026-43964) has been identified in the postfix Mail Transport Agent (MTA) used in Red Hat Enterprise Linux 8.8. The flaw involves a buffer over-read triggered by a malformed enhanced status code. Red Hat has issued an important security update to address this issue in postfix version 3.5.8-4.el8_8.1. The vulnerability is rated as having a high severity impact. No public exploit or confirmed exploitation in the wild has been reported. Users of affected Red Hat Enterprise Linux 8.8 variants are advised to apply the provided security update promptly.

References

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