Bug 2464249 (CVE-2026-40685) - CVE-2026-40685 Exim: Exim: Denial of Service due to malformed JSON processing
Summary: CVE-2026-40685 Exim: Exim: Denial of Service due to malformed JSON processing
Keywords:
Status: NEW
Alias: CVE-2026-40685
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-30 22:01 UTC by OSIDB Bzimport
Modified: 2026-05-05 15:04 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2026-04-30 22:01:35 UTC 
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.
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