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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Score 6.5 from GitHub Security Advisory published 2026-05-01. NVD baseline CVSS 6.5; sources differ by 0.0.
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.
April 30, 2026
May 1, 2026
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | eximon4 (4.98.2-1ubuntu2.1) @ questing | 2026-05-20 | ubuntu |
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CWE-787