mutt before 2.3.2 has a show_sig_summary NULL pointer dereference.

The remote SUSE Linux SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2300-1 advisory.

    This update for mutt fixes the following issues

    - CVE-2026-43859: `strfcpy` used instead of `memcpy` for the IMAP `auth_cram` MD5 digest (bsc#1263897).
    - CVE-2026-43860: truncation of `hash_passwd` by one byte for IMAP `auth_cram` MD5 digest (bsc#1263896).
    - CVE-2026-43861: missing check for `\0` in `url_pct_decode` (bsc#1263895).
    - CVE-2026-43862: mishandling of the `imap_auth_gss` security level (bsc#1263894).
    - CVE-2026-43863: infinite loop in `data_object_to_stream` in `crypt-gpgme.c` (bsc#1263893).
    - CVE-2026-43864: NULL pointer dereference in function `show_sig_summary` (bsc#1263892).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2301-1 advisory.

    This update for mutt fixes the following issues

    - CVE-2026-43859: `strfcpy` used instead of `memcpy` for the IMAP `auth_cram` MD5 digest (bsc#1263897).
    - CVE-2026-43860: truncation of `hash_passwd` by one byte for IMAP `auth_cram` MD5 digest (bsc#1263896).
    - CVE-2026-43861: missing check for `\0` in `url_pct_decode` (bsc#1263895).
    - CVE-2026-43862: mishandling of the `imap_auth_gss` security level (bsc#1263894).
    - CVE-2026-43863: infinite loop in `data_object_to_stream` in `crypt-gpgme.c` (bsc#1263893).
    - CVE-2026-43864: NULL pointer dereference in function `show_sig_summary` (bsc#1263892).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - mutt before 2.3.2 has a show_sig_summary NULL pointer dereference. (CVE-2026-43864)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
321070	SUSE SLES12 Security Update : mutt (SUSE-SU-2026:2300-1)	Nessus	SuSE Local Security Checks	low
321013	SUSE SLED15 / SLES15 Security Update : mutt (SUSE-SU-2026:2301-1)	Nessus	SuSE Local Security Checks	low
312039	Linux Distros Unpatched Vulnerability : CVE-2026-43864	Nessus	Misc.	low

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CVE-2026-43864

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