Fedora 43 mbedtls Critical Buffer Underflow NULL Pointer 2026-8c332fbf00
fedora
April 10, 2026
Update to 3.6.6
Summary
Mbed TLS is a light-weight open source cryptographic and SSL/TLS
library written in C. Mbed TLS makes it easy for developers to include
cryptographic and SSL/TLS capabilities in their (embedded)
applications with as little hassle as possible.
Update Information:
Update to 3.6.6
Change Log
* Thu Apr 2 2026 Peter Robinson
References
[ 1 ] Bug #2454030 - CVE-2026-25833 mbedtls: buffer underflow in x509_inet_pton_ipv6() [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2454030
[ 2 ] Bug #2454045 - CVE-2026-34874 mbedtls: NULL pointer dereference when setting a distinguished name [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2454045
[ 3 ] Bug #2454085 - CVE-2026-34871 mbedtls: entropy on Linux can fall back to /dev/urandom [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2454085
[ 4 ] Bug #2454116 - CVE-2026-25835 mbedtls: PSA random generator cloning [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2454116
[ 5 ] Bug #2454193 - CVE-2026-34873 mbedtls: Mbed TLS: Client impersonation during TLS 1.3 session resumption [fedora-all]
https://bugzilla.redhat.com/show_bug.cgi?id=2454193
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-8c332fbf00' 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
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Name: mbedtls
Product: Fedora 43
Version: 3.6.6
Release: 1.fc43
Summary: Light-weight cryptographic and SSL/TLS library
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