onyx

onyx --cves cve-2026-40685

CVE-2026-40685

MEDExim
score
<0.1
cvss
6.5
epss
0.6%
published
2026-04-30
kev added
—
first seen

Exim < 4.99.2 contains an out-of-bounds heap write caused by incorrect backslash escaping in JSON lookup when processing malformed JSON in untrusted headers, letting remote attackers cause memory corruption, exploit requires JSON lookup enabled.

Timeline

How this CVE moved toward exploitation. Chart: last 30 days — trend score, EPSS, community mentions per day; hover the event lane.

events2026-04-30 — PublishedP2026-10-21 — Tracked by OnyxTscore2026-10-21: score <0.1<0.1epss2026-09-22: epss 0.3%2026-09-23: epss 0.3%2026-09-24: epss 0.6%2026-09-25: epss 0.6%2026-09-26: epss 0.6%2026-09-27: epss 0.6%2026-09-29: epss 0.6%2026-09-30: epss 0.6%2026-10-01: epss 0.6%2026-10-02: epss 0.6%2026-10-03: epss 0.6%2026-10-04: epss 0.6%2026-10-05: epss 0.6%2026-10-06: epss 0.6%2026-10-07: epss 0.6%2026-10-08: epss 0.6%2026-10-09: epss 0.6%2026-10-10: epss 0.6%2026-10-11: epss 0.6%2026-10-12: epss 0.6%2026-10-13: epss 0.6%2026-10-14: epss 0.6%2026-10-15: epss 0.6%2026-10-16: epss 0.6%2026-10-18: epss 0.6%2026-10-19: epss 0.6%2026-10-20: epss 0.6%2026-10-21: epss 0.6%0.6%mentions/day0no mentions in 30 days2026-09-22today
  1. Published
  2. Tracked by Onyx

Weaknesses

CWE-684 CWE-787

References 5