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CVE-2026-64785

SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control characters reach an HTTP/1.1 backend through NIOHTTP2's HTTP/2-to-HTTP/1 codec, enabling HTTP request smuggling or response splitting. This vulnerability is addressed in swift-nio-http2 version 1.45.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5e6b206ac22dacb58ff455bd97322002d9999071640ceb214b76194007dcac37
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-444","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /containers/adp/0/problemTypes/0/descriptions/0

{"description":"SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control characters reach an HTTP/1.1 backend through NIOHTTP2's HTTP/2-to-HTTP/1 codec, enabling HTTP request smuggling or response splitting.","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"swift-nio-http2","vendor":"Apple","versions":[{"lessThan":"1.45.0","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-444","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /containers/adp/0/problemTypes/0/descriptions/0
{"description":"SwiftNIO HTTP/2 was missing validation on inbound HEADERS frames that let CR, LF, NUL, SP and other control characters reach an HTTP/1.1 backend through NIOHTTP2's HTTP/2-to-HTTP/1 codec, enabling HTTP request smuggling or response splitting.","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"url":"https://github.com/apple/swift-nio-http2/security/advisories/GHSA-q3g2-m552-3r9c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2abf5616a37b2f010c974c3e4e901e771a3e2030513292382ca5a4867a5affb9 · sha256:84282a2cb56f0685… · /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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