VULNERABILITY INTELLIGENCE

CVE-2026-40685

CVSS score6.5 MEDIUM
EPSS probability0.32%
CISA KEVNot currently listed
Published2026-04-30
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H

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.

Weakness classification

  • cve@mitre.org: CWE-684
  • nvd@nist.gov: CWE-787

Primary references