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Fencer Intel
medium 4.0

CVE-2026-94057 json

Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted dat…

published last mo. modified last mo. also EUVD-2026-83615

cvss
4.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 9%
public exploits
0
none known

Summary

Exim before 4.100.1 allows SMTP smuggling in which the received message does not match any sent message, and instead depends on crafted data sent after a rejection during DATA processing.

Patch / fix

  • Exim Exim 4.100.1
  • exim4 Debian 13 4.98.2-1+deb13u5
  • exim4 Debian 14 4.100.1-1

debian advisories DEBIAN-CVE-2026-94057

  • exim4 Ubuntu 22.04 LTS 4.95-4ubuntu2.12
  • exim4 Ubuntu 24.04 LTS 4.97-4ubuntu4.8
  • exim4 Ubuntu 26.04 LTS 4.99.1-1ubuntu1.5

ubuntu advisories UBUNTU-CVE-2026-94057

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

Is CVE-2026-94057 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-94057 updated cvss 4.0

exim: Exim: SMTP smuggling via crafted data during DATA processing

  • 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
partial
Assessed
last mo.

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 4.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

  • Exim Exim

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences

References

Sources

Fencer Intel 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.