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Debian LTS Advisory DLA-4551-1 [email protected]
https://www.debian.org/lts/security/ Andrej Shadura
April 27, 2026 https://wiki.debian.org/LTS
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Package : mbedtls
Version : 2.16.9-0.1+deb11u4
CVE ID : CVE-2025-59438 CVE-2026-34871
CVE-2025-59438
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
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