RUSTSEC-2026-0320 CVE-2026-115382 GHSA-w4qr-p94g-mjhv

Wasmtime wasi:http implementation panics with a zero timeout supplied

Not rated yet crates.io

Severity: 0.0 / 10; Unknown · CVSS 4.0
Exploit chance (EPSS): 0.28%; Chance of exploitation in the next 30 days. Higher than 20.10% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: —; Not classified
Fix: 49.0.2; Upgrade wasmtime-wasi-http to this version or later

Description

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-w4qr-p94g-mjhv For more information see the GitHub-hosted security advisory.

Affected versions

crates.io

Package	Vulnerable	Fixed in
wasmtime-wasi-http	`>= 46.0.0, < 48.0.4` `>= 49.0.0, < 49.0.2`	`48.0.4` `49.0.2`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

wasmtime-wasi-http crates.io → `49.0.2`

cargo

cargo update -p wasmtime-wasi-http --precise 49.0.2

Severity breakdown

CVSS 4.0 0.0

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

Attack vector: Network
Attack complexity: Low
Attack requirements: Present
Privileges required: Low
User interaction: Passive
Confidentiality (vulnerable system): None
Integrity (vulnerable system): None
Availability (vulnerable system): High
Confidentiality (subsequent systems): None
Integrity (subsequent systems): None
Availability (subsequent systems): None

References

Advisories

rustsec.org/advisories/RUSTSEC-2026-0320.html

Packages

crates.io/crates/wasmtime-wasi-http

Timeline

Oct 2, 2026 Published
Oct 24, 2026 Last updated by the source
Nov 1, 2026 Latest EPSS score

Advisory	Severity	Why it's related
RUSTSEC-2026-0421 wasi-http p2: outgoing content-length can be invalid or not match body	Low	Also affects wasmtime-wasi-http
RUSTSEC-2026-0377 `wasi-http` p3: forwarded trailers aren't checked against `is_forbidden_header` hook	Low	Also affects wasmtime-wasi-http
RUSTSEC-2026-0376 `wasi-http`: Guests can add conflicting content lengths to messages	Low	Also affects wasmtime-wasi-http
RUSTSEC-2026-0375 `wasi-http` p3: Guests can set incorrect content-length for spliced response bodies	Medium	Also affects wasmtime-wasi-http
RUSTSEC-2026-0351 `wasi-http`: Request with long url before query parameter crashes host	Medium	Also affects wasmtime-wasi-http
RUSTSEC-2026-0350 Guests can send absolute-form HTTP requests to different hosts	Not rated yet	Also affects wasmtime-wasi-http
RUSTSEC-2026-0313 Outgoing HTTP body write allows guest-driven host memory exhaustion	Medium	Also affects wasmtime-wasi-http

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