Insufficient Verification of Data Authenticity Affecting unbound-utils-debuginfo package, versions <0:1.17.1-1.amzn2023.0.15


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.17% (6th percentile)

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  • Snyk IDSNYK-AMZN2023-UNBOUNDUTILSDEBUGINFO-20246899
  • published29 Sept 2026
  • disclosed16 Sept 2026

Introduced: 16 Sep 2026

CVE-2026-77955  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 unbound-utils-debuginfo to version 0:1.17.1-1.amzn2023.0.15 or higher.
This issue was patched in ALAS2023-2026-3127.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unbound-utils-debuginfo package and not the unbound-utils-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1