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Fedora 44 glibc Security Advisory FEDORA-2026-ced72ab158 Buffer Overflow

fedora
Calendar Grey May 2, 2026
Dist Fedora Esm H88
Recent Fedora 44 update addresses critical security flaws in glibc, including buffer overflow and memory corruption issues.
This update provides various security fixes

Summary

The glibc package contains standard libraries which are used by

multiple programs on the system. In order to save disk space and

memory, as well as to make upgrading easier, common system code is

kept in one place and shared between programs. This particular package

contains the most important sets of shared libraries: the standard C

library and the standard math library. Without these two libraries, a

Linux system will not function.

Update Information:

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)

Topics%20covered

Topics Covered

security advisory denial of service fedora buffer overflow memory corruption glibc

Change Log

* Thu Apr 30 2026 Florian Weimer - 2.43-4 - Add downstream patches with fixes for vulnerabilities. - Fix buffer overflow in scanf %mc (CVE-2026-5450) - Fix ns_sprintrrf buffer overreads (CVE-2026-6238) - Fix ns_sprintrrf buffer overflow in TSIG record processing (CVE-2026-5435) - Fix memory corruption in ungetwc (CVE-2026-5928) - Auto-sync with upstream branch release/2.43/master, commit 8362e8ce10b24068bacc19552c128dd10e082fd9: - iconv: Use pending character state in IBM1390, IBM1399 character sets (CVE-2026-4046)

References


[ 1 ] Bug #2453212 - CVE-2026-4046 glibc: glibc: Denial of Service via iconv() function with specific character sets [fedora-all] https://bugzilla.redhat.com/show_bug.cgi?id=2453212

Update Instructions

This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-ced72ab158' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

Severity
important
Lowest
Low
Medium
High
Critical

Name: glibc
Product: Fedora 44
Version: 2.43
Release: 4.fc44
URL: http://www.gnu.org/software/glibc/
Summary: The GNU libc libraries

Topics%20covered

Topics Covered

security advisory denial of service fedora buffer overflow memory corruption glibc

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