{"affected":[{"product":"wasm-micro-runtime","source":"CNA: GitHub_M","vendor":"bytecodealliance","versions":[{"status":"affected","version":"< 2.4.5"}]}],"cveId":"CVE-2026-54912","cwes":["CWE-787"],"description":"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.","epss":null,"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/wasm-micro-runtime/wasm-micro-runtime/security/advisories/GHSA-jjv3-x3jf-cg49"}],"kev":null,"metrics":[{"score":8.8,"severity":"high","source":"CNA: GitHub_M","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"}],"modifiedAt":1793904291857,"publishedAt":1793899758708,"references":[{"source":"CNA: GitHub_M","tags":["x_refsource_CONFIRM"],"url":"https://github.com/wasm-micro-runtime/wasm-micro-runtime/security/advisories/GHSA-jjv3-x3jf-cg49"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/wasm-micro-runtime/wasm-micro-runtime/commit/b1353b5e8983047ff68829c99abf1355d5f389cf"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://gist.github.com/shumbo/b710c35b005ed871447fce385d1ab760"},{"source":"CNA: GitHub_M","tags":["x_refsource_MISC"],"url":"https://github.com/wasm-micro-runtime/wasm-micro-runtime/releases/tag/WAMR-2.4.5"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/wasm-micro-runtime/wasm-micro-runtime/security/advisories/GHSA-jjv3-x3jf-cg49"}],"remediation":[],"revision":"297fbbf87271f176bf07ad6e4d914b8f8c1d8dec59b00220c43c43a08f4853f5","sources":[{"modifiedAt":1793904291857,"name":"CNA: GitHub_M","retrievedAt":1793905813484,"url":"https://www.cve.org/CVERecord?id=CVE-2026-54912"}],"ssvc":{"assessedAt":1793904142842,"automatable":"no","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"WAMR fast interpreter loader heap buffer overflow via constant deduplication mismatch","updatedAt":1793905813484}