ANT-2026-669BEQ2W · WAMR · Heap Buffer Overflow

heap-buffer-overflow low Severity Claude low · Security research firm low · Maintainer - Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Trail of Bits. ANT-2026-669BEQ2W: Integer overflow in array.new size...

wamr:wamr_fuzz_llvm_jit: Null-dereference READ in ubsan_GetStackTrace

Detailed Report: https://oss-fuzz.com/testcase?key=5126779546435584 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzllvmjit Job Type: libfuzzerubsanwamr Platform Id: linux Crash Type: Null-dereference READ Crash Address: 0x000000000000 Crash State: ubsanGetStackTrace Sanitizer:...

wamr:wamr_fuzz_llvm_jit: Null-dereference READ in wasm_runtime_invoke_native

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=4776431766011904 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzllvmjit Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Null-dereference READ Crash...

wamr:wamr_fuzz_llvm_jit: Null-dereference READ in execute_post_instantiate_functions

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=4578967146528768 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzllvmjit Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Null-dereference READ Crash...

wamr:wamr_fuzz_llvm_jit: Null-dereference READ in wasm_runtime_invoke_native

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=4554314369794048 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzllvmjit Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Null-dereference READ Crash...

wamr:wamr_fuzz_llvm_jit: Null-dereference READ in os_thread_wrapper

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=5568564682883072 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzllvmjit Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Null-dereference READ Crash...

wamr:wamr_fuzz_aot_compiler: Crash in llvm::RegisterTargetMachine<llvm::X86TargetMachine>::Allocator

Detailed Report: https://oss-fuzz.com/testcase?key=4622114757083136 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzaotcompiler Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: UNKNOWN READ Crash Address: 0x000100000004 Crash State: llvm::RegisterTargetMachine::Allocator...

CVE-2025-64713: Improper Restriction of Operations within the Bounds of a Memory Buffer

WebAssembly Micro Runtime WAMR is a lightweight standalone WebAssembly Wasm runtime. Prior to version 2.4.4, an out-of-bounds array access issue exists in WAMR's fast interpreter mode during WASM bytecode loading. When framerefbottom and frameoffsetbottom arrays are at capacity and a GETGLOBALI32...

CVE-2025-64704: Improper Check for Unusual or Exceptional Conditions

WebAssembly Micro Runtime WAMR is a lightweight standalone WebAssembly Wasm runtime. Prior to version 2.4.4, WAMR is susceptible to a segmentation fault in v128.store instruction. This issue has been patched in version 2.4.4...

WAMR runtime hangs or crashes with large memory.fill addresses in LLVM-JIT mode

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AZL-67617 CVE-2025-58749 affecting package fluent-bit for versions less than 3.0.6-4

WebAssembly Micro Runtime WAMR is a lightweight standalone WebAssembly Wasm runtime. In WAMR versions prior to 2.4.2, when running in LLVM-JIT mode, the runtime cannot exit normally when executing WebAssembly programs containing a memory.fill instruction where the first operand memory address...

CVE-2025-58749: Untrusted Pointer Dereference

WebAssembly Micro Runtime WAMR is a lightweight standalone WebAssembly Wasm runtime. In WAMR versions prior to 2.4.2, when running in LLVM-JIT mode, the runtime cannot exit normally when executing WebAssembly programs containing a memory.fill instruction where the first operand memory address...

wamr:wamr_fuzz_classic_interp: Heap-buffer-overflow in wasm_loader_prepare_bytecode

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=4624226721267712 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzclassicinterp Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Heap-buffer-overflow READ 2...

wamr:wamr_fuzz_classic_interp: Memcpy-param-overlap in wasm_interp_call_func_bytecode

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=6610586214662144 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzclassicinterp Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Memcpy-param-overlap Crash...

CVE-2025-54126 WebAssembly Micro Runtime's `--addr-pool` option allows all IPv4 addresses when subnet mask is not specified

The WebAssembly Micro Runtime's WAMR iwasm package is the executable binary built with WAMR VMcore which supports WebAssembly System Interface WASI and command line interface. In versions 2.4.0 and below, iwasm uses --addr-pool with an IPv4 address that lacks a subnet mask, allowing the system to...

CVE-2025-54126

The WebAssembly Micro Runtime's WAMR iwasm package is the executable binary built with WAMR VMcore which supports WebAssembly System Interface WASI and command line interface. In versions 2.4.0 and below, iwasm uses --addr-pool with an IPv4 address that lacks a subnet mask, allowing the system to...

wamr:wamr_fuzz_fast_interp: Heap-buffer-overflow in load_global_import

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=5426598314835968 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzfastinterp Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Heap-buffer-overflow WRITE 8...

wamr:wamr_fuzz_classic_interp: Crash in load_init_data_section

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=6593826544484352 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzclassicinterp Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: UNKNOWN READ Crash Address:...

wamr:wamr_fuzz_llvm_jit: Heap-buffer-overflow in load_global_import

Project: https://github.com/bytecodealliance/wasm-micro-runtime.git Detailed Report: https://oss-fuzz.com/testcase?key=5378070527934464 Project: wamr Fuzzing Engine: libFuzzer Fuzz Target: wamrfuzzllvmjit Job Type: libfuzzerasanwamr Platform Id: linux Crash Type: Heap-buffer-overflow WRITE 8 Cras...

CVE-2025-43853 iwasm vulnerable to filesystem sandbox escape with symlink when using uvwasi feature

The WebAssembly Micro Runtime's WAMR iwasm package is the executable binary built with WAMR VMcore which supports WebAssembly System Interface WASI and command line interface. Anyone running WAMR up to and including version 2.2.0 or WAMR built with libc-uvwasi on Windows is affected by a symlink...