Medium severity6.5NVD Advisory· Published Apr 30, 2026· Updated May 1, 2026
CVE-2026-40685
CVE-2026-40685
Description
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.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- code.exim.org/exim/exim/commit/9fdc057e71b87c87a0d3d2288b2810a0efaaba57nvdPatch
- exim.org/static/doc/security/cve-2026-04.1/CVE2026-40685.assessmentnvdVendor Advisory
- www.openwall.com/lists/oss-security/2026/04/30/21nvdMailing ListThird Party Advisory
- exim.org/static/doc/security/CVE-2026-40685.txtnvdBroken Link
News mentions
0No linked articles in our index yet.