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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. 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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7e7673fab43f21cfb4ef82af3a7c9c7493b9ae163a67b62022b71f1173c0fef6
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"description":"n/a","lang":"en","type":"text"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-345","description":"CWE-345 Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/adp/0/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"description":"n/a","lang":"en","type":"text"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-345","description":"CWE-345 Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://www.knot-dns.cz/2026-04-01-version-3410.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/cna/references/0
{"url":"https://www.knot-dns.cz/2026-04-02-version-354.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f43bcd4ca5e614617f81afe9a65ec7b79c7d1ce81798c6ce59d2a9d8bdd8e98c · sha256:e5b7d2bab35fce78… · /containers/cna/references/1

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.

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