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CVE-2026-43964

33
FAUCET Score

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 published: May 4, 2026Last modified: May 4, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 3.8.16CPE matchmatch criteria
cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
>= 3.9.0, < 3.9.10CPE matchmatch criteria
cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
>= 3.10.0, < 3.10.9CPE matchmatch criteria
cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
>= 3.10, < 3.10.9CPE match
cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*
>= 2.3, < 3.8.16CPE match
cpe:2.3:a:postfix:postfix:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

3.7LOW

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 Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
34.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0042 is in the 13th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 21306-17084Fixed in: 3.9.11-1
microsoftpatch availablevia msrc
Product: azl3 postfix 3.9.0-2 on Azure Linux 3.0Fixed in: 3.9.11-1
ubuntupatch availablevia ubuntu_usn
Product: postfix (jammy)Fixed in: 3.6.4-1ubuntu1.4
ubuntupatch availablevia ubuntu_usn
Product: postfix (noble)Fixed in: 3.8.6-1ubuntu0.1
ubuntupatch availablevia ubuntu_usn
Product: postfix (questing)Fixed in: 3.10.2-1ubuntu2.1
ubuntupatch availablevia ubuntu_usn
Product: postfix (resolute)Fixed in: 3.10.6-4ubuntu2.1

Vendor Advisories (2)

ubuntuUSN-8253-1

Postfix vulnerability

May 7, 2026
microsoft2026-May/CVE-2026-43964Low

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.

May 2, 2026

References

access.redhat.com / errata/RHSA-2026:25930
access.redhat.com / errata/RHSA-2026:25932
access.redhat.com / errata/RHSA-2026:26205
access.redhat.com / security/cve/CVE-2026-43964
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-43964.json
openwall.com / lists/oss-security/2026/05/04/30
Mailing ListThird Party Advisory
mail-archive.com / [email protected]/msg00110.html
Mailing ListThird Party Advisory