CVE-2026-115382

5.9 mediumEPSS 0.3%

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.

CVSS 4.0: 5.9CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 4.8CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H
EPSS: 0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-25)
CWE: CWE-1284
Published: 2026-10-22
Modified: 2026-10-23
Record from: the NVD, synced 2026-10-23

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
RUSTSEC-2026-0320	crates.io	wasmtime-wasi-http	>=46.0.0 <48.0.4 >=49.0.0 <49.0.2	48.0.4, 49.0.2

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-panic-dos

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