Bug#1134543: glibc: CVE-2026-5450

Salvatore Bonaccorso <[email protected]> Tue, 21 Apr 2026 17:49:45 +0200

Newsgroups	gmane.linux.debian.devel.glibc
Message-ID	<177678658555.354165.8983271565082973845.reportbug__24678.1351439253$1776786687$gmane$org@eldamar.lan>

Source: glibc
Version: 2.42-15
Severity: important
Tags: security upstream
Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=34008
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for glibc.

CVE-2026-5450[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-5450
    https://www.cve.org/CVERecord?id=CVE-2026-5450
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=34008
[2] https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0009

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore