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Advisories

Wasmtime before 36.0.20 HTTP Request Smuggling via wasi-http p2 Content-Length

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Severity
medium
Date
Affecting

  • wasmtime >= 0, < 36.0.20

  • wasmtime >= 37.0.0, < 48.0.8

  • wasmtime >= 49.0.0, < 49.0.5

  • wasmtime >= 50.0.0, < 50.0.1

CWE
  • CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Description
The wasmtime-wasi-http p2 implementation in Wasmtime before 36.0.20, 37.0.0 before 48.0.8, 49.0.0 before 49.0.5, and 50.0.0 before 50.0.1 can send conflicting content-length headers, or ones not matching the body, in outgoing requests. A guest that reuses a received response's headers resource to send a bodyless request can enable request smuggling against non-compliant servers, potentially bypassing embedder destination access controls.

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