wasmtime has a panic when allocating a table exceeding the size of the host's address space

Impact Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables ca...

GHSA-P8XM-42R7-89XG wasmtime has a panic when allocating a table exceeding the size of the host's address space

Impact Wasmtime's allocation logic for a WebAssembly table contained checked arithmetic which panicked on overflow. This overflow is possible to trigger, and thus panic, when a table with an extremely large size is allocated. This is possible with the WebAssembly memory64 proposal where tables ca...

Panic when allocating a table exceeding the size of the host's address space

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg For more information see the GitHub-hosted security advisory...

RUSTSEC-2026-0114 Panic when allocating a table exceeding the size of the host's address space

This is an entry in the RustSec database for the Wasmtime security advisory located at https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p8xm-42r7-89xg For more information see the GitHub-hosted security advisory...

PT-2026-38398

Name of the Vulnerable Software and Affected Versions Wasmtime versions prior to 36.0.8 Wasmtime versions prior to 43.0.2 Wasmtime versions prior to 44.0.1 Description Allocation logic for a WebAssembly table contains checked arithmetic that panics on overflow when a table with an extremely large...

Exploit for Access of Uninitialized Pointer in Bytecodealliance Wasmtime

No d...

wasmtime:call_async: Crash in <wasmtime::runtime::instance::Instance>::start_raw::<wasmtime_fuzzing::oracles::

Project: https://github.com/bytecodealliance/wasmtime.git Detailed Report: https://oss-fuzz.com/testcase?key=6125949392584704 Project: wasmtime Fuzzing Engine: libFuzzer Fuzz Target: callasync Job Type: libfuzzerasanwasmtime Platform Id: linux Crash Type: UNKNOWN WRITE Crash Address: 0x7624b92af0...

wasmtime:gc_ops: Crash in <pulley_interpreter::interp::Vm>::call_run

Project: https://github.com/bytecodealliance/wasmtime.git Detailed Report: https://oss-fuzz.com/testcase?key=4769510606569472 Project: wasmtime Fuzzing Engine: libFuzzer Fuzz Target: gcops Job Type: libfuzzerasanwasmtime Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x7c93fe501018...

OSV-2026-603 UNKNOWN READ in <wasmtime::runtime::func::Func>::call_unchecked_raw::<

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=504268343 Crash type: UNKNOWN READ Crash state: ::calluncheckedraw::::callimpldocall:: wasmtimeinternalfiber::stackswitch::x8664::wasmtimefiberstart...

PT-2026-36288

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=504268343 Crash type: UNKNOWN READ Crash state: ::call unchecked raw::::call impl do call:: wasmtime internal fiber::stackswitch::x86 64::wasmtime fiber start...

wasmtime:gc_ops: Crash in <wasmtime::runtime::func::Func>::call_unchecked_raw::<wasmtime_fuzzing::oracles:

Project: https://github.com/bytecodealliance/wasmtime.git Detailed Report: https://oss-fuzz.com/testcase?key=5176018876039168 Project: wasmtime Fuzzing Engine: libFuzzer Fuzz Target: gcops Job Type: libfuzzerasanwasmtime Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x76f71f9b03b8...

wasmtime:wast_tests: Crash in <wasmtime::runtime::func::Func>::call_unchecked_raw::<

Project: https://github.com/bytecodealliance/wasmtime.git Detailed Report: https://oss-fuzz.com/testcase?key=4937916005810176 Project: wasmtime Fuzzing Engine: libFuzzer Fuzz Target: wasttests Job Type: libfuzzerasanwasmtime Platform Id: linux Crash Type: UNKNOWN READ Crash Address:...

SUSE CVE-2026-34971

Wasmtime is a runtime for WebAssembly. From 32.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Cranelift compilation backend contains a bug on aarch64 when performing a certain shape of heap accesses which means that the wrong address is accessed. When combined with explicit bounds checks a...

SUSE CVE-2026-34983

Wasmtime is a runtime for WebAssembly. In 43.0.0, cloning a wasmtime::Linker is unsound and can result in use-after-free bugs. This bug is not controllable by guest Wasm programs. It can only be triggered by a specific sequence of embedder API calls made by the host. Specifically, the following...

SUSE CVE-2026-34987

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime with its Winch baseline non-default compiler backend may allow properly constructed guest Wasm to access host memory outside of its linear-memory sandbox. This vulnerability requires use of the Winch...

SUSE CVE-2026-35186

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler backend contains a bug where translating the table.grow operator causes the result to be incorrectly typed. For 32-bit tables this means that the result of the operator, internally i...

SUSE CVE-2026-35195

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime's implementation of transcoding strings between components contains a bug where the return value of a guest component's realloc is not validated before the host attempts to write through the pointer. This...

SUSE CVE-2026-34943

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, Wasmtime contains a possible panic which can happen when a flags-typed component model value is lifted with the Val type. If bits are set outside of the set of flags the component model specifies that these bits...

SUSE CVE-2026-34944

Wasmtime is a runtime for WebAssembly. Prior to 24.0.7, 36.0.7, 42.0.2, and 43.0.1, On x86-64 platforms with SSE3 disabled Wasmtime's compilation of the f64x2.splat WebAssembly instruction with Cranelift may load 8 more bytes than is necessary. When signals-based-traps are disabled this can resul...

SUSE CVE-2026-34945

Wasmtime is a runtime for WebAssembly. From 25.0.0 to before 36.0.7, 42.0.2, and 43.0.1, Wasmtime's Winch compiler contains a bug where a 64-bit table, part of the memory64 proposal of WebAssembly, incorrectly translated the table.size instruction. This bug could lead to disclosing data on the...