Inclusion of Functionality from Untrusted Control Sphere Affecting exim package, versions <4.99.5-r0


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-EXIM-18968788
  • published20 Aug 2026
  • disclosed24 Jul 2026

Introduced: 24 Jul 2026

CVE-2026-66141  (opens in a new tab)
CWE-829  (opens in a new tab)

How to fix?

Upgrade Chainguard exim to version 4.99.5-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream exim package and not the exim package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Exim before 4.99.5 allows .forward privilege escalation because force_command for a pipe transport is mishandled.

CVSS Base Scores

version 3.1