CVE-2026-40685

Published: Mag 01, 2026 Last Modified: Mag 01, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 6,5
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: high

Description

AI Translation Available

In Exim before 4.99.2, when JSON lookup is enabled, an out-of-bounds heap write can occur when a JSON operator encounters malformed JSON in an untrusted header, because of an incorrect implementation of \ skipping.

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
0,0005
Percentile
0,2th
Updated

Single Data Point

Only one EPSS measurement is available for this CVE. Trend analysis requires multiple data points over time.

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
787

Out-of-bounds Write

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Availability Other
Potential Impacts:
Modify Memory Execute Unauthorized Code Or Commands Dos: Crash, Exit, Or Restart Unexpected State
Applicable Platforms
Languages: Assembly, C, C++, Memory-Unsafe
Technologies: ICS/OT
Likelihood of Exploit: High
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
https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3…
https://code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-…
https://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessment
https://exim.org/static/doc/security/CVE-2026-40685.txt
https://exim.org/static/doc/security/CVE-2026-40685.txt
https://www.openwall.com/lists/oss-security/2026/04/30/21
https://www.openwall.com/lists/oss-security/2026/04/30/21