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Fedora 44 glibc Security Advisory FEDORA-2026

Linuxsecurity •LinuxSecurity Advisories • May 2, 2026

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)

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.

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)

* 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)

[ 1 ] Bug #2453212 - CVE-2026-4046 glibc: glibc: Denial of Service via iconv() function with specific character sets [fedora-all]

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

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Buffer Overflow Vulnerabilities in glibc Affect Fedora Systems A major update for the glibc package in Fedora has been released to address multiple security vulnerabilities, including buffer overflows and memory corruption issues. The vulnerabilities include CVE-2026-5450, CVE-2026-6238, CVE-2026-5435, CVE-2026-5928, and CVE-2026-4046, which could potentially allow attackers to exploit these flaws to execute arbitrary code or cause denial of service. The vulnerabilities affect all systems using Fedora 43 and 44 with the glibc library. The update was released on April 30, 2026, and is critical for maintaining system integrity and security. Users are advised to apply the update immediately using the 'dnf' update program. The vulnerabilities were published between March 30 and April 28, 2026. The glibc library is essential for the functioning of Linux systems, making these vulnerabilities particularly concerning. 2 sources 74

Extracted Entities

Fedora 44 glibc Security Advisory FEDORA-2026

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Extracted Entities

Attack Types (1)

CVEs (5)

CWE Weaknesses (3)

Platforms (1)