CVE-2026-119141

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the mayleave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, su...

CVE-2026-119143

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows guest code to trigger a host panic through out-of-bounds zero-length stream operations. Malicious guests can perform zero-length component model stream reads or writes with unvalidated...

CVE-2026-119132

Wasmtime from 49.0.0 before 49.0.3 contains a denial-of-service vulnerability that allows a WebAssembly guest to trigger a host panic by transcoding overlapping strings in fused adapters. Attackers can make a same-instance component-to-component call transferring a string whose source and...

EUVD-2026-113210

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows guest code to trigger a host panic through out-of-bounds zero-length stream operations. Malicious guests can perform zero-length component model stream reads or writes with unvalidated...

CVE-2026-119143 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows guest code to trigger a host panic through out-of-bounds zero-length stream operations. Malicious guests can perform zero-length component model stream reads or writes with unvalidated...

CVE-2026-119142

The Wasmtime runtime versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 are vulnerable to a denial of service condition. The root cause is located in the TypedFunc::call_async function, where dropping the returned Future can cause a host panic. Specifically, if a guest task has not yet starte...

CVE-2026-119142 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via call_async Drop

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability where dropping the Future returned by TypedFunc::callasync can panic the host. When the guest task has not started, cleanup code searches only one location for work items and unwraps the resulting...

CVE-2026-119143 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via Zero-Length Stream Writes

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows guest code to trigger a host panic through out-of-bounds zero-length stream operations. Malicious guests can perform zero-length component model stream reads or writes with unvalidated...

CVE-2026-119142 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via call_async Drop

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability where dropping the Future returned by TypedFunc::callasync can panic the host. When the guest task has not started, cleanup code searches only one location for work items and unwraps the resulting...

CVE-2026-119143

The Wasmtime runtime (versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3) is vulnerable to a denial of service issue. Guest code can trigger a host panic by performing out-of-bounds zero-length stream operations within the component model. Specifically, malicious guests can execute zero-lengt...

CVE-2026-119142 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via call_async Drop

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability where dropping the Future returned by TypedFunc::callasync can panic the host. When the guest task has not started, cleanup code searches only one location for work items and unwraps the resulting...

CVE-2026-119141

The Wasmtime runtime is vulnerable to a denial of service (DoS) condition in versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 . The root cause is that the may_leave flag is not cleared during a realloc operation, which allows malicious Wasm modules to panic the host. Specifically, an attack...

CVE-2026-119141 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via realloc

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the mayleave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, su...

CVE-2026-119141 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via realloc

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the mayleave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, su...

CVE-2026-119141 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via realloc

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service vulnerability that allows malicious Wasm modules to panic the host because the mayleave flag is not cleared during realloc. Attackers can call into the host from realloc while lowering stream or future results, su...

CVE-2026-119139 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via Func::call

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a leftover assertion in component::Func::call that rejects guest exports using the async ABI option. An attacker who supplies a component with an async-lifted export can crash the host process when an embedder invokes that export...

CVE-2026-119139

Wasmtime versions 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 are vulnerable to a host crash due to a leftover assertion in component::Func::call. This assertion incorrectly rejects guest exports that utilize the async ABI option. An attacker providing a component with an async-lifted export ca...

CVE-2026-119139 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Host Panic via Func::call

Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a leftover assertion in component::Func::call that rejects guest exports using the async ABI option. An attacker who supplies a component with an async-lifted export can crash the host process when an embedder invokes that export...

CVE-2026-119132 Wasmtime 49.0.0 before 49.0.3 Host Panic via Overlapping String Transcode in Fused Adapter

Wasmtime from 49.0.0 before 49.0.3 contains a denial-of-service vulnerability that allows a WebAssembly guest to trigger a host panic by transcoding overlapping strings in fused adapters. Attackers can make a same-instance component-to-component call transferring a string whose source and...

CVE-2026-119132

The Wasmtime runtime (versions 49.0.0 before 49.0.3 ) is vulnerable to a denial-of-service flaw. The root cause is the transcoding of overlapping strings within fused adapters , which allows a WebAssembly guest to trigger a host panic . An attacker can cause a host crash by making a same-instance...