Answer in brief
CVE-2026-19941 records a Medium severity (CVSS 5.9) vulnerability in checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof. The current sources do not mark it as known exploited. The current feed maps ISC/BIND 9 (generic), ISC/BIND 9 (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps ISC/BIND 9 (generic), ISC/BIND 9 (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| ISC/BIND 9generic | >=9.11.0 <=9.18.50 || >=9.20.0 <=9.20.27 || >=9.21.0 <=9.21.25 || >=9.11.3-S1 <=9.18.50-S1 || >=9.20.9-S1 <=9.20.27-S1 | Not reported |
| ISC/BIND 9generic | 9.11.0 || 9.20.0 || 9.21.0 || 9.11.3-S1 || 9.20.9-S1 | Not reported |
Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 16, 2026
An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Quoted source text, attributed separately from HOL analysis.