CVE Explorer

CVE-2026-44434

Quicly is an IETF QUIC protocol implementation intended primarily for use within the H2O HTTP server. Prior to commit dccf5d4, Quicly was vulnerable to stateless reset injection through lack of packet entry validation. The QUIC protocol is designed to withstand packet injection attacks, once the handshake is complete. Only packets that carry some secret patterns are considered as stateless resets. Quicly allows the peer to share up to 4 such patterns per connection. However, until now, it failed

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7f673c89ef1a75a0d677481946e20cd0da3b40b45ab87e63627882aaff1b652b

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"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:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-665","description":"CWE-665: Improper Initialization","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion

{"product":"quicly","vendor":"h2o","versions":[{"status":"affected","version":"< dccf5d4"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /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:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions

{"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:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-665","description":"CWE-665: Improper Initialization","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions

{"name":"https://github.com/h2o/quicly/commit/dccf5d4579c7ae9dd6e8f90c36d52e311bb60710","tags":["x_refsource_MISC"],"url":"https://github.com/h2o/quicly/commit/dccf5d4579c7ae9dd6e8f90c36d52e311bb60710"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /containers/cna/references/1

{"name":"https://github.com/h2o/quicly/security/advisories/GHSA-899f-49jq-pfh8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/h2o/quicly/security/advisories/GHSA-899f-49jq-pfh8"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:a1892c573a4284659da73af57c9aadd80d29278db0996f429e876651ecf6932a · sha256:460cbab1d3718346… · /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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