medium6.5
CVE-2026-39155
Knot DNS before 3.4.10 and 3.5.x before 3.5.4 contains a vulnerability in mod-onlinesign where the next NSEC owner name can be computed incorrectly.
Impact
Knot DNS before 3.4.10 and 3.5.x before 3.5.4 contains a vulnerability in mod-onlinesign where the next NSEC owner name can be computed incorrectly. This can create an overly broad authenticated denial interval, allowing downstream validating resolvers using aggressive negative caching to synthesize negative answers for legitimate names and causing resolver-side denial of service.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Knot DNS | Knot DNS | before 3.4.10 |
| 3.5.X | before 3.5.4 |
Versions were read from the advisory text. No structured product data has been published for this record yet.