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Debian 11: mbedtls Important Use-After-Free Fix DLA-4274-2 CVE-2025-47917

debian lts
Calendar Grey August 30, 2025
Dist Debian Esm H88
Debian LTS DLA-4275-3 releases updates for mbedtls to patch CVE-2025-47918, fixing critical memory corruption vulnerabilities.
The previous update, 2.16.9-0.1+deb11u2, fixed the following security issue: CVE-2025-47917
Topics%20covered

Topics Covered

security advisory security issue debian important use-after-free mbedtls

Summary

CVE-2025-47917

MbedTLS allows use-after-free in certain situations in the correctly
developed applications.

Unfortunately, the fix was incomplete and introduced a potential regression
in other correctly developed applications.

For Debian 11 bullseye, this problem has been fixed in version
2.16.9-0.1+deb11u3.

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/source-package/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


Severity
important
Lowest
Low
Medium
High
Critical

Package: mbedtls
Version: 2.16.9-0.1+deb11u3
CVE ID: CVE-2025-47917

Topics%20covered

Topics Covered

security advisory security issue debian important use-after-free mbedtls

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