CVE-2026-8257

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.

• CWE-617

• https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19Exploit
• https://github.com/WebAssembly/binaryen/Product
• https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291cPatch
• https://github.com/WebAssembly/binaryen/issues/8633Exploit, Issue Tracking, Third Party Advisory
• https://github.com/WebAssembly/binaryen/pull/8635Mitigation, Patch
• https://vuldb.com/submit/809552Third Party Advisory, VDB Entry
• https://vuldb.com/vuln/362554Third Party Advisory, VDB Entry
• https://vuldb.com/vuln/362554/ctiPermissions Required, VDB Entry

Published

May 11, 2026

Last Modified

Jul 23, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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