ELA-1568-2 unbound1.9 security update

cache poisoning vulnerability

2025-12-01
Packageunbound1.9
Version1.9.0-2+deb10u2~deb9u8 (stretch)
Related CVEs CVE-2025-11411


Yuxiao Wu, Yunyi Zhang, Baojun Liu and Haixin Duan discovered that the initial fix for CVE-2025-11411 as applied in ELA 1568-1 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 9 stretch, these problems have been fixed in version 1.9.0-2+deb10u2~deb9u8.

We recommend that you upgrade your unbound1.9 packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.