CVE-2026-40685

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Summary

CVECVE-2026-40685
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-30 22:16:25 UTC
Updated2026-05-01 02:16:03 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-684 | CWE-684 CWE-684 Incorrect Provision of Specified Functionality

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Exim Exim affected 4.99.2 semver Not specified

References

ReferenceSourceLinkTags
exim.org/static/doc/security/CVE-2026-40685.txt [email protected] exim.org
www.openwall.com/lists/oss-security/2026/04/30/21 [email protected] www.openwall.com
code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57 [email protected] code.exim.org
exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessment [email protected] exim.org
exim.org/static/doc/security/CVE-2025-40685.txt MITRE exim.org
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