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[SECURITY] [DLA 4365-2] unbound security update



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Debian LTS Advisory DLA-4365-2                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                       Guilhem Moulin
November 30, 2025                             https://wiki.debian.org/LTS
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Package        : unbound
Version        : 1.13.1-1+deb11u7
CVE ID         : CVE-2025-11411
Debian Bug     : 1121446

Yuxiao Wu, Yunyi Zhang, Baojun Liu and Haixin Duan discovered that the
initial fix for CVE-2025-11411 as applied in DLA 4365-1 did not fully
fix the vulnerability.  Updated packages correcting this issue are now
available.

Additionally, this update includes a fix for potential amplification
DDoS attacks due to improperly following cleared RD flags.

For Debian 11 bullseye, this problem has been fixed in version
1.13.1-1+deb11u7.

We recommend that you upgrade your unbound packages.

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

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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