CVE Explorer
CVE-2026-44687
In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in 'harden-below-nxdomain' logic; enabled by default. It effectively bypasses the configuration and the configured stub/forward zone is never contacted. 'harden-below-nxdomain' does an upward DNS cache walk together with a d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"Unbound","vendor":"NLnet Labs","versions":[{"lessThan":"1.25.2","status":"affected","version":"1.13.2","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:150ad0a4118dd221028ebd6eb456543c378294edae32e723e804a56de9d1ad56 · sha256:de6d07319487e21d… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"baseScore":3.7,"baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:150ad0a4118dd221028ebd6eb456543c378294edae32e723e804a56de9d1ad56 · sha256:de6d07319487e21d… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-193","description":"CWE-193: Off-by-one Error","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:150ad0a4118dd221028ebd6eb456543c378294edae32e723e804a56de9d1ad56 · sha256:de6d07319487e21d… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"tags":["vendor-advisory"],"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-44687.txt"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:150ad0a4118dd221028ebd6eb456543c378294edae32e723e804a56de9d1ad56 · sha256:de6d07319487e21d… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.