CVE-2026-115382

Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 contains a denial-of-service vulnerability in its wasi:http implementation that allows guests to panic the host. Guests can specify a zero between-bytes-timeout request option, which is forwarded directly to a Tokio API that panics, crashing the host embedding.

Score

CVSS 4.0 5.9 Medium

Status

Deferred - disclosure@vulncheck.com

Published

2026-10-22

Last modified

2026-10-23

Weaknesses

CWE-1284

Affected products

• Wasmtime (Bytecodealliance)

References

• https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w4qr-p94g-mjhv
• https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.4-and-49.0.0-before-49.0.2-wasi-http-zero-timeout-pani…