Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via wasi-http
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 48.0.6, 49.0.3
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Wasmtime, a WebAssembly runtime, is affected when its wasi-http component is used, allowing a guest program to crash the host application by sending a very long request URL. The impact is a denial of service, as the host process panics and stops running.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability in wasmtime-wasi-http that lets guests crash the host by sending long request URLs. Guests can use set-path-with-query with a '?' after byte 65535, overflowing a u16 index in the http crate and triggering a host panic.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- bytecodealliance wasmtime
From 46.0.0 · fixed in 48.0.6; From 49.0.0 · fixed in 49.0.3
- wasmtime-wasi-httpcrates.io
From 46.0.0 · fixed in 48.0.6; From 49.0.0 · fixed in 49.0.3