2.5

CVE-2026-43864: mutt NULL Pointer Dereference

Deferred
AliasesUBUNTU-CVE-2026-43864DEBIAN-CVE-2026-43864
Published 04-05-2026Last modified 04-05-2026

Vulnerability summary

CVE-2026-43864 is a low (CVSS 2.5) NULL Pointer Dereference vulnerability in mutt. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 2.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
2.5/10
010
Low · v3.1 (CVE.org)
EPSS score
0.10%
0%100%
Low · -0.02 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21016-1SUSE-SU-2026:22340-1

Timeline

  1. 04-05-2026
    PublishedVulnerability first disclosed.
  2. 04-05-2026
    Last modifiedVulnerability information updated.

Description

mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.10%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Decrease -0.02 pp

From 0.12% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • muttAll versions (No fix recorded) | < 2.2.13-1+deb13u1 | < 2.3.2-1
Mutt1 product
Ubuntu1 product
  • muttAll versions (No fix recorded)

3 vendors · 3 products

References

4 links