CVE-2026-121441 — Vulnerability intelligence

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Published: 2026-11-03T15:17:35.927

CVSS

6.3

CISA KEV

Not listed; not proof of no exploitation

Original source text (not a translation)

Wasmtime before 36.0.19, 37.0.0 before 48.0.7, and 49.0.0 before 49.0.4 contains a request smuggling vulnerability in wasi-http that allows guests to set multiple conflicting content-length headers. Malicious guests can make the host send HTTP requests with conflicting content-length values to smuggle requests through servers or intermediaries that do not reject them.

Sources

• CVE-2026-121441
• Original advisory
• Original advisory