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Debian LTS: Unbound CVE-2025-11411 Important DDoS Risk Fix DLA-4365-2

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. . ------------------------------------------------------------------------- Debian LTS Advisory DLA-4365-2 This email address is being protected from spambots. You need JavaScript enabled to view it. https://www.debian.org/lts/security/ Guilhem Moulin November 30, 2025 https://wiki.debian.org/LTS ------------------------------------------------------------------------- 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/source-package/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 . Updated unbound packages available for Debian LTS to address CVE-2025-11411 fully and mitigate DoS attacks risk.. Debian LTS, unbound update, security fix, amplification DDoS, CVE-2025-11411. . Severity: Important. LinuxSecurity.com Team

Nov 30, 2025 •Important Debian LTS