Debian 11 mbedtls DLA-4551-1 CVE-2025-59438 Timing Leak

Observable Timing Discrepancy. The presence of a padding error could
leak through timings, enabling the attacker to recover information
about the secret.

CVE-2026-34871

On systems where getrandom() was not available, /dev/urandom would be
used a fallback instead of /dev/random.

For Debian 11 bullseye, these problems have been fixed in version
2.16.9-0.1+deb11u4.

We recommend that you upgrade your mbedtls packages.

For the detailed security status of mbedtls please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/mbedtls

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS