CVE-2026-121439
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Nov 03, 2026
Vendor
unknown
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.