Red Hat Security Advisory: postfix security update
The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS. Security Fix(es): * postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
AI Analysis
Technical Summary
CVE-2026-43964 is a buffer over-read vulnerability in postfix caused by processing a malformed enhanced status code. Postfix is a Mail Transport Agent supporting protocols such as LDAP, SMTP AUTH (SASL), and TLS. The flaw could lead to a denial of service due to application crash or instability but does not impact confidentiality or integrity. Red Hat has issued security advisories and updates for postfix packages in Red Hat Enterprise Linux 10 to remediate this vulnerability.
Potential Impact
The vulnerability results in a low-severity impact with no confidentiality or integrity loss but with potential availability impact due to a buffer over-read. The CVSS v3.1 base score is 3.7 (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L), indicating that remote attackers could cause a denial of service under certain conditions. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated postfix packages that fix this vulnerability. Users of affected Red Hat Enterprise Linux 10 systems should apply the official security updates as described in the Red Hat advisory RHSA-2026:25930. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation steps are required beyond applying the official patch.
Red Hat Security Advisory: postfix security update
Description
The postfix packages provide a Mail Transport Agent (MTA), which supports protocols like LDAP, SMTP AUTH (SASL), and TLS. Security Fix(es): * postfix: buffer over-read via malformed enhanced status code (CVE-2026-43964) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-43964 is a buffer over-read vulnerability in postfix caused by processing a malformed enhanced status code. Postfix is a Mail Transport Agent supporting protocols such as LDAP, SMTP AUTH (SASL), and TLS. The flaw could lead to a denial of service due to application crash or instability but does not impact confidentiality or integrity. Red Hat has issued security advisories and updates for postfix packages in Red Hat Enterprise Linux 10 to remediate this vulnerability.
Potential Impact
The vulnerability results in a low-severity impact with no confidentiality or integrity loss but with potential availability impact due to a buffer over-read. The CVSS v3.1 base score is 3.7 (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L), indicating that remote attackers could cause a denial of service under certain conditions. There are no known exploits in the wild at this time.
Mitigation Recommendations
Red Hat has released updated postfix packages that fix this vulnerability. Users of affected Red Hat Enterprise Linux 10 systems should apply the official security updates as described in the Red Hat advisory RHSA-2026:25930. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation steps are required beyond applying the official patch.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-43964
- Cve Count
- 1
Threat ID: 6a21eb1ae29bf47b50d25cd3
Added to database: 06/04/2026, 21:16:10 UTC
Last enriched: 08/07/2026, 02:11:43 UTC
Last updated: 09/14/2026, 04:08:00 UTC
Views: 154
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.