CVE-2026-115382

Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoS

State: Published
Severity: 5.9 Medium
Published: Oct 22, 2026
Updated: Oct 23, 2026
Reserved: Oct 22, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.9 Medium	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	4.8 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-1284 Improper Validation of Specified Quantity in Input

Affected Products

Product	Versions
wasmtimebytecodealliance	46.0.0 to before 48.0.4Affected 48.0.4Not affected 49.0.0 to before 49.0.2Affected 49.0.2Not affected

References

GitHub Security Advisory (GHSA-w4qr-p94g-mjhv)vendor-advisory
VulnCheck Advisory: Wasmtime 46.0.0 before 48.0.4 and 49.0.0 before 49.0.2 wasi:http Zero Timeout Panic DoSthird-party-advisory

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.