CVE-2026-54912 (GCVE-0-2026-54912)
Vulnerability from cvelistv5 – Published: 2026-11-05 17:29 – Updated: 2026-11-05 18:44
VLAI
EPSS
VEX
Title
WAMR fast interpreter loader heap buffer overflow via constant deduplication mismatch
Summary
WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to 2.4.5, the two-pass fast interpreter loader in core/iwasm/interpreter/wasm_loader.c can make inconsistent constant-table decisions between the sizing pass and the emitting pass. After duplicate constants inflate the first pass beyond the constant-slot limit, wasm_loader_get_const_offset emits later constants inline, but the between-pass sort and deduplication reduces the table so the second pass can choose table references and cause reserve_block_ret to emit additional copy operands that were not included in code_compiled_peak_size. A crafted module can therefore make the second pass write partially attacker-controlled compiled-code data beyond the heap buffer allocated from the first pass's size calculation during wasm_runtime_load, before guest code executes. This can corrupt host heap metadata and deterministically crash the process, causing denial of service; further consequences depend on the host application's heap layout. Builds using WAMR_BUILD_FAST_INTERP=1 are affected; disabling the fast interpreter avoids the vulnerable loader. This issue is fixed in version 2.4.5.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-05 18:42 UTC
CWE
- CWE-787 - Out-of-bounds Write
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/wasm-micro-runtime/wasm-micro-… | x_refsource_CONFIRM |
| https://github.com/wasm-micro-runtime/wasm-micro-… | x_refsource_MISC |
| https://gist.github.com/shumbo/b710c35b005ed87144… | x_refsource_MISC |
| https://github.com/wasm-micro-runtime/wasm-micro-… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| bytecodealliance | wasm-micro-runtime |
Affected:
< 2.4.5
|
guessed |
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