CVE-2026-40684

Published: Mag 01, 2026 Last Modified: Mag 01, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,9
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0006
Percentile
0,2th
Updated

EPSS Score Trend (Last 2 Days)

684

Incorrect Provision of Specified Functionality

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Other
Potential Impacts:
Quality Degradation
Applicable Platforms
All platforms may be affected
View CWE Details
Application

Exim by Exim

Product Information
Vendor Exim
Product Exim
Version Range Affected
To 4.99.2 (exclusive)
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
http://www.openwall.com/lists/oss-security/2026/05/01/11
http://www.openwall.com/lists/oss-security/2026/05/01/11
https://code.exim.org/exim/exim/commit/628bbaca7672748d941a…
https://code.exim.org/exim/exim/commit/628bbaca7672748d941a12e7cd5f0122a4e18c81
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-…
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40684.assessment
https://exim.org/static/doc/security/CVE-2026-40684.txt
https://exim.org/static/doc/security/CVE-2026-40684.txt
https://www.openwall.com/lists/oss-security/2026/04/30/21
https://www.openwall.com/lists/oss-security/2026/04/30/21