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Postfix CVE-2026-43964

| EUVD-2026-27115 LOW
Off-by-one Error (CWE-193)
2026-05-04 mitre
3.7
CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

2
Patch available
May 04, 2026 - 20:01 EUVD
Analysis Generated
May 04, 2026 - 19:30 vuln.today

DescriptionNVD

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.

AnalysisAI

Postfix versions before 3.8.16, 3.9.10, and 3.10.9 are vulnerable to a buffer over-read and process crash when processing specially crafted enhanced status codes lacking text after the third numeric digit. Remote unauthenticated attackers can trigger a denial of service by sending malformed SMTP responses, causing the Postfix process to crash. …

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CVE-2026-43964 vulnerability details – vuln.today

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