Vulnerability Description
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 panics when the host reads a component model stream as a different Rust item type than it was created with, because the host-to-host read path asserts matching TypeIds instead of returning an error. Guest code can return a host-created StreamReader<U> that the embedder reads as StreamReader<T>, where both types map to the same component model type, crashing the embedding process.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-
- https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-be
FAQ
What is CVE-2026-119135?
CVE-2026-119135 is a vulnerability with a CVSS score of 4.8 (MEDIUM). Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 panics when the host reads a component model stream as a different Rust item type than it was created with, because the host-to-host read path as...
How severe is CVE-2026-119135?
CVE-2026-119135 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-119135?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.