CVE-2026-43964
Received
Received - Intake
Buffer Over-Read in Postfix SMTP Server
Publication date: 2026-05-04
Last updated on: 2026-05-04
Assigner: MITRE
Description
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.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| postfix | postfix | to 3.8.16 (exc) |
| postfix | postfix | to 3.9.10 (exc) |
| postfix | postfix | to 3.10.9 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-193 | A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects certain versions of Postfix (before 3.8.16, 3.9 before 3.9.10, and 3.10 before 3.10.9). It occurs when an enhanced status code is received that lacks text after the third number, which can cause a buffer over-read and lead to the process crashing.
How can this vulnerability impact me? :
The vulnerability can cause the Postfix process to crash due to a buffer over-read. This results in a denial of service condition, potentially disrupting mail services.
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