CVE Explorer

CVE-2026-40209

An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f0ee41b4280c755f368f8ff51fb0b0d4bfe39277e1ea89fdf078412e529fe541

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"description":"Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-772","description":"CWE-772 Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /containers/adp/0/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion

{"collectionURL":"https://repo.powerdns.com/","defaultStatus":"unaffected","modules":["DNS over TCP to the backend"],"packageName":"dnsdist","product":"DNSdist","programFiles":["dnsdist-tcp-downstream.cc"],"repo":"https://github.com/PowerDNS/pdns","vendor":"PowerDNS","versions":[{"lessThan":"1.9.15","status":"affected","version":"1.9.0","versionType":"semver"},{"lessThan":"2.0.7","status":"affected","version":"2.0.0","versionType":"semver"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"description":"Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-772","description":"CWE-772 Missing Release of Resource after Effective Lifetime","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /containers/adp/0/problemTypes/0/descriptions/0

Source references

1 source assertion

{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6b4d565fb4b48d862771c2a8b6ce2dbcf624450f048af159644e1c04b379dcdb · sha256:4ca9cc82c08567ce… · /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.

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