CVE-2026-43964

3.7 LOW 0.5% exploit odds No fix listed Denial of service

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 0.5% chance of exploitation in the next 30 days (EPSS).
Fix: No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

2026-05-04 19:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-08-20 13:18 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.5% in the next 30 days (EPSS).
Severity: 3.7 LOW (CVSS).
Fix: none linked yet, which raises it.

Details

Published: 2026-05-04 19:16 UTC
Last modified: 2026-08-20 13:18 UTC
Exploit probability: 0.5% · EPSS, next 30 days
Weakness: CWE-193
Record status: Modified

Affected

Postfix < 3.8.16
Postfix < 3.9.10
Postfix < 3.10.9

Attack profile CVSS 3.1 · 3.7

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Raw vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-43964.md and follow it. Check whether this project is affected by CVE-2026-43964. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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References

NVD record · CVE.org record