CVEvulnerability

CVE-2026-40685

9.8 CRITICAL Published 2026-04-30 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-04-30
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-684, CWE-787

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 configurations

• exim exim (< 4.99.2)

Related

Weakness · CWE (2)

  • CWE-684 Incorrect Provision of Specified Functionality weakness
  • CWE-787 Out-of-bounds Write weakness

References