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Fencer Vulns
low 3.7

CVE-2026-43862 json

In mutt before 2.3.2, the imap_auth_gss security level is mishandled.

published 2026-05-04 6 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-26900

cvss
3.7
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 5%
public exploits
0
none known

Summary

In mutt before 2.3.2, the imap_auth_gss security level is mishandled.

Patch / fix

  • mutt mutt 2.3.2
  • mutt Debian 13 2.2.13-1+deb13u1
  • mutt Debian 14 2.3.2-1

debian advisories DEBIAN-CVE-2026-43862

  • mutt SLES for SAP applications 16.0, SLES 16.0 2.2.16-160000.2.1

suse advisories SUSE-SU-2026:22340-1

  • mutt openSUSE Leap 16.0 2.2.16-160000.2.1
  • mutt openSUSE Tumbleweed 2.3.2-1.1

opensuse advisories openSUSE-SU-2026:21016-1openSUSE-SU-2026:10695-1

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-2026-43862 updated cvss 3.7

mutt: Mutt: Security bypass due to mishandled IMAP authentication

  • Red Hat Enterprise Linux 6 mutt
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 mutt Red Hat Enterprise Linux 8 mutt Red Hat Enterprise Linux 9 mutt Red Hat Enterprise Linux 10 mutt
    affected: no fix available “Fix deferred”

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
6 mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

  • mutt mutt

Classification

Weakness
  • CWE-843 Access of Resource Using Incompatible Type

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.