CVE-2026-44690 Affecting unbound-anchor-debuginfo package, versions <0:1.17.1-1.amzn2023.0.13


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.14% (5th percentile)

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  • Snyk IDSNYK-AMZN2023-UNBOUNDANCHORDEBUGINFO-18530833
  • published5 Aug 2026
  • disclosed22 Jul 2026

Introduced: 22 Jul 2026

NewCVE-2026-44690  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 unbound-anchor-debuginfo to version 0:1.17.1-1.amzn2023.0.13 or higher.
This issue was patched in ALAS2023-2026-2033.

NVD Description

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

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison arbitrary sibling zones under NSEC-signed parent domains. A malicious actor with one registered domain under an NSEC-signed TLD can serve malicious insecure DNS responses for unrelated sibling domains (sharing the same parent zone). Arbitrary delegations that do not exist under the parent domain and are covered by the parent's NSEC chain can be brought into insecure existence by fraudulent wildcard DS records (less labels than expected, unknown algorithm) from the malicious sibling domain. This allows the malicious actor to inject insecure wildcard records for those delegations.

CVSS Base Scores

version 3.1