What is GHSA-j86m-34pm-p9mv?

GHSA-j86m-34pm-p9mv is a security advisory published by GitHub Security Advisories with Medium severity. Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 fails to check forwarded trailers against...

Which CVE IDs does GHSA-j86m-34pm-p9mv cover?

GHSA-j86m-34pm-p9mv covers the following CVE IDs: CVE-2026-121440. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-j86m-34pm-p9mv?

GHSA-j86m-34pm-p9mv has a CVSS v3 base score of 3.7, published by GitHub Security Advisories.

GHSA-j86m-34pm-p9mvMediumCVSS 3.7

Wasmtime 46.0.0 before 48.0.7 and 49.0.0 before 49.0.4 fails to check forwarded trailers against...

Vendor

GitHub Security Advisories

Published

November 3, 2026

Last Modified

November 3, 2026

🔗 CVE IDs covered (1)

CVE-2026-121440 →

📋 Description

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.

🔗 References (4)

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-jxcf-8qw5-5c33
https://nvd.nist.gov/vuln/detail/CVE-2026-121440
https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.7-and-49.0.0-before-49.0.4-forwarded-trailers-header-filter-bypass
https://github.com/advisories/GHSA-j86m-34pm-p9mv