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CVE-2026-8257

WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

CVSS 4.8 MEDIUMEPSS 0.2%CWE-617
A vulnerability was detected in WebAssembly Binaryen up to 117. This issue affects the function IRBuilder::makeBrOn of the file src/wasm/wasm-ir-builder.cpp of the component BrOn Parser. Performing a manipulation results in reachable assertion. The attack needs to be approached locally. The exploit is now public and may be used. The patch is named 1251efbc1ea471c1311d2726b2bbe061ff2a291c. It is suggested to install a patch to address this issue.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Affected products
WebAssembly · Binaryen
public PoCs found — 1
cve_referencegithub.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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References
https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19https://github.com/WebAssembly/binaryen/https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291chttps://github.com/WebAssembly/binaryen/issues/8633https://github.com/WebAssembly/binaryen/pull/8635https://vuldb.com/submit/809552https://vuldb.com/vuln/362554https://vuldb.com/vuln/362554/cti