CVE Explorer

CVE-2026-21435

webtransport-go is an implementation of the WebTransport protocol. Prior to v0.10.0, an attacker can cause a denial of service in webtransport-go by preventing or indefinitely delaying WebTransport session closure. A malicious peer can withhold QUIC flow control credit on the CONNECT stream, blocking transmission of the WT_CLOSE_SESSION capsule and causing the close operation to hang. This vulnerability is fixed in v0.10.0.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8c011225290d91edd41e76779407d5a4e74fd82165d1edd7f894dd418fe95d61

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"webtransport-go","vendor":"quic-go","versions":[{"status":"affected","version":"< 0.10.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ea47bf6cb8c3f0d1a032a4d1df71c775485723cb9429bb833a6c6898de7517b1 · sha256:9e5d22443018ef44… · /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:ea47bf6cb8c3f0d1a032a4d1df71c775485723cb9429bb833a6c6898de7517b1 · sha256:9e5d22443018ef44… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ea47bf6cb8c3f0d1a032a4d1df71c775485723cb9429bb833a6c6898de7517b1 · sha256:9e5d22443018ef44… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0","tags":["x_refsource_MISC"],"url":"https://github.com/quic-go/webtransport-go/releases/tag/v0.10.0"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ea47bf6cb8c3f0d1a032a4d1df71c775485723cb9429bb833a6c6898de7517b1 · sha256:9e5d22443018ef44… · /containers/cna/references/1

{"name":"https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/quic-go/webtransport-go/security/advisories/GHSA-px4r-g4p3-hhqv"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ea47bf6cb8c3f0d1a032a4d1df71c775485723cb9429bb833a6c6898de7517b1 · sha256:9e5d22443018ef44… · /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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