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›vulnerability›CVE-2026-77955
Name
CVE-2026-77955
Source
NVD ( link)Debian ( link)
Description
In NLnet Labs Unbound 1.13.2 up to and including 1.26.1, a vulnerability in ZONEMD configured zones (zonemd-check: yes) which are located below (but not at) a trust anchor allow for an attack window where (tampered with) zone contents are served (or stored to disk) prior to the ZONEMD integrity check. This is caused by the needed DS/DNSKEY asynchronous resolution that needs to happen before the ZONEMD check completes. If a zonefile is written to disk (zonefile: option) while the ZONEMD check failed, the tampered data are reloaded on startup and available until ZONEMD verification concludes again. If verification fails, the data is not served any more but still persists on disk for future reloads.
Published Date
Updated Date
Workaround
-

Analysis#


Affected Component
Analysis
unbound
Exploitable

Vulnerability Ratings#


4.4
CVSSv31
NaN
other

Others affected components#


Name
Project
Project Version
Version
Status
buildroot
2025.02.x
1.26.1
Not Affected
buildroot
master
1.26.1
Not Affected
openwrt
master
1.26.1-r1
Not Affected
openwrt
openwrt-25.12
1.26.1-r1
Not Affected
yocto
master
1.26.1
Not Affected
yocto
scarthgap
1.19.3
Exploitable