CVE-2026-121439

MediumCVSS 5.3/10Last modified Nov 9, 2026

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-444

Affected software

Vendor	Product	Versions
bytecodealliance	wasmtime	>= 46.0.0, < 48.0.7; >= 49.0.0, < 49.0.4

References

Timeline

Published: Nov 3, 2026
Last modified: Nov 9, 2026
NVD status: Deferred

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