Medium severity5.3NVD Advisory· Published Nov 3, 2026· Updated Nov 3, 2026
CVE-2026-121439
CVE-2026-121439
Description
Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 contains a response splitting vulnerability in wasi-http p3 that allows guests to set unvalidated content-length headers. Malicious wasip3 guests can splice an existing body into a new response with an incorrect content-length to perform response splitting or injection attacks.
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Affected products
1- Range: <48.0.7, <49.0.4
Patches
Vulnerability mechanics
References
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