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CVE Vulnerability Details :
CVE-2026-40684
PUBLISHED
More InfoOfficial Page
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
View Known Exploited Vulnerability (KEV) details
Published At-30 Apr, 2026 | 00:00
Updated At-01 May, 2026 | 17:22
Rejected At-
▼CVE Numbering Authority (CNA)

In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.

Affected Products
Vendor
EximExim
Product
Exim
Default Status
unaffected
Versions
Affected
  • From 0 before 4.99.2 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-684CWE-684 Incorrect Provision of Specified Functionality
Type: CWE
CWE ID: CWE-684
Description: CWE-684 Incorrect Provision of Specified Functionality
Metrics
VersionBase scoreBase severityVector
3.15.9MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 5.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.openwall.com/lists/oss-security/2026/04/30/21
N/A
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40684.assessment
N/A
https://code.exim.org/exim/exim/commit/628bbaca7672748d941a12e7cd5f0122a4e18c81
N/A
https://exim.org/static/doc/security/CVE-2026-40684.txt
N/A
Hyperlink: https://www.openwall.com/lists/oss-security/2026/04/30/21
Resource: N/A
Hyperlink: https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40684.assessment
Resource: N/A
Hyperlink: https://code.exim.org/exim/exim/commit/628bbaca7672748d941a12e7cd5f0122a4e18c81
Resource: N/A
Hyperlink: https://exim.org/static/doc/security/CVE-2026-40684.txt
Resource: N/A
▼Authorized Data Publishers (ADP)
1. CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
2. CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
http://www.openwall.com/lists/oss-security/2026/05/01/11
N/A
Hyperlink: http://www.openwall.com/lists/oss-security/2026/05/01/11
Resource: N/A
Details not found