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Fencer Vulns
high 8.4

CVE-2026-66140 json

Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because argument…

published 2026-07-24 3 mo ago modified 2026-08-17 2 mo ago also EUVD-2026-48478

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

Exim before 4.99.5 allows directory traversal to access files outside of the spool area, and consequently gain privileges, because arguments related to queue-name are mishandled.

Patch / fix

  • Exim Exim 4.99.5
  • exim4 Debian 13 4.98.2-1+deb13u4
  • exim4 Debian 14 4.99.4-2

debian advisories DEBIAN-CVE-2026-66140

  • exim4 Ubuntu 22.04 LTS 4.95-4ubuntu2.11
  • exim4 Ubuntu 24.04 LTS 4.97-4ubuntu4.7
  • exim4 Ubuntu 26.04 LTS 4.99.1-1ubuntu1.4

ubuntu advisories UBUNTU-CVE-2026-66140

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • exim Alpine 3.24 4.98.5-r0

alpine advisories ALPINE-CVE-2026-66140

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66140 updated cvss 8.4

exim: Exim: Privilege escalation via directory traversal due to mishandled queue-name arguments

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Exim Exim

Classification

Weakness
  • CWE-24 Path Traversal: '../filedir'

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.