Low severity · published May 4, 2026
CVE-2026-43864
mutt before 2.3.2 has a show_sig_summary NULL pointer dereference
2.5
CVSS
0.1%
EPSS
No
On KEV
Description
mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Attack vector
Local
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MU
mutt · mutt
before 2.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43864
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43864
github.com
https://github.com/muttmua/mutt/commit/ebfa2969042d89303d15334193fcc32866c8a8df
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