Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version 2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in a one byte heap buffer overflow.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4b7780802c advisory.

    This update provides various security fixes.

    * Buffer overflow in `scanf` `%mc` (CVE-2026-5450)
    * `ns_sprintrrf` buffer overreads (CVE-2026-6238)
    * `ns_sprintrrf` buffer overflow in TSIG record processing (CVE-2026-5435)
    * Memory corruption in `ungetwc` (CVE-2026-5928)
    * Assertion failure in `iconv` with IBM1390, IBM1399 charsets (CVE-2026-4046)


Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ced72ab158 advisory.

    This update provides various security fixes.

    * Buffer overflow in `scanf` `%mc` (CVE-2026-5450)
    * `ns_sprintrrf` buffer overreads (CVE-2026-6238)
    * `ns_sprintrrf` buffer overflow in TSIG record processing (CVE-2026-5435)
    * Memory corruption in `ungetwc` (CVE-2026-5928)
    * Assertion failure in `iconv` with IBM1390, IBM1399 charsets (CVE-2026-4046)


Tenable has extracted the preceding description block directly from the Fedora 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.

  - Calling the scanf family of functions with a %mc (malloc'd character match) in the GNU C Library version     2.7 to version 2.43 with a format width specifier with an explicit width greater than 1024 could result in     a one byte heap buffer overflow. (CVE-2026-5450)

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

ID	Name	Product	Family	Severity
312242	Fedora 43 : glibc (2026-4b7780802c)	Nessus	Fedora Local Security Checks	critical
311773	Fedora 44 : glibc (2026-ced72ab158)	Nessus	Fedora Local Security Checks	critical
308167	Linux Distros Unpatched Vulnerability : CVE-2026-5450	Nessus	Misc.	critical

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CVE-2026-5450

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