CVE-2026-121440 — Vulnerability intelligence
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Published:
- CVSS
- 6.3
- CISA KEV
- Not listed; not proof of no exploitation
Original source text (not a translation)
Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 fails to check forwarded trailers against the WasiHttpHooks::is_forbidden_header hook in wasi-http p3. WASIp3 guests can forward a request or response body so its trailers skip embedder-customized forbidden header filtering, undermining header restrictions the embedder intended.