Alerts This Week
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Alerts This Week
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Alert for Major Buffer Overflow Memory Issue in Fedora 43 glibc Update

fedora
Calendar Grey May 3, 2026
Dist Fedora Esm H88
Critical security advisory for Fedora 43 glibc update addressing 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 critical memory corruption

Change Log

* Thu Apr 30 2026 Florian Weimer - 2.42-12 - 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/2.42/master, commit f13c1bb0f97fbc12a6ba1ab5669ce561ea32b80a: - 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-2026-4b7780802c' 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
critical
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Name: glibc
Product: Fedora 43
Version: 2.42
Release: 12.fc43
URL: http://www.gnu.org/software/glibc/
Summary: The GNU libc libraries

Topics%20covered

Topics Covered

security advisory denial of service fedora buffer overflow critical memory corruption

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