Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Postfix Postfix unaffected
Version Status Constraints
2.3 affected < 3.8.16
3.9 affected < 3.9.10
3.10 affected < 3.10.9

No data.

No data.

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No data.

Project Subscriptions

Vendors Products
Postfix Subscribe
Postfix Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.mail-archive.com/postfix-announce@postfix.org/msg00110.html cve-icon cve-icon
History

Mon, 04 May 2026 21:45:00 +0000

Type Values Removed Values Added
Title Postfix Enhanced Status Code Buffer Over-read Crash

Mon, 04 May 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 04 May 2026 19:00:00 +0000

Type Values Removed Values Added
Description Postfix before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9 sometimes allows a buffer over-read and process crash via an enhanced status code that lacks text after the third number.
First Time appeared Postfix
Postfix postfix
Weaknesses CWE-193
CPEs cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
Vendors & Products Postfix
Postfix postfix
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-05-04T19:49:41.165Z

Reserved: 2026-05-04T18:10:10.120Z

Link: CVE-2026-43964

cve-icon Vulnrichment

Updated: 2026-05-04T19:49:36.675Z

cve-icon NVD

Status : Received

Published: 2026-05-04T19:16:07.143

Modified: 2026-05-04T19:16:07.143

Link: CVE-2026-43964

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-04T21:30:09Z

Weaknesses