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CVE-2026-21438

webtransport-go is an implementation of the WebTransport protocol. Prior to 0.10.0, an attacker can cause unbounded memory consumption repeatedly creating and closing many WebTransport streams. Closed streams were not removed from an internal session map, preventing garbage collection of their resources. This vulnerability is fixed in v0.10.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f89d2ce1dedd2c6693d0a43dec543809deedf0459b3b3219e570dfb986d74782
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

{"cweId":"CWE-459","description":"CWE-459: Incomplete Cleanup","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-401","description":"CWE-401: Missing Release of Memory after Effective Lifetime","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /containers/cna/problemTypes/0/descriptions/0

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:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /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:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-459","description":"CWE-459: Incomplete Cleanup","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-401","description":"CWE-401: Missing Release of Memory after Effective Lifetime","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /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:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /containers/cna/references/1
{"name":"https://github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/quic-go/webtransport-go/security/advisories/GHSA-2f2x-8mwp-p2gc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:cb460f3ad1dcaeddf17e3b82cecde82d4c6d9f0259dfc74767014e7f588cdcef · sha256:d162f2c10f5b3c82… · /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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