PT-2026-39550 · Webassembly · Binaryen

Pwn3Rd · Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-8257

NVD

CVSS v2.0

1.7

Low

Base vector

AV:L/AC:L/Au:S/C:N/I:N/A:P

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.

Exploit

Fix

Assertion Failure

Weakness Enumeration

CWE-617

Related Identifiers

CVE-2026-8257

Affected Products

Binaryen

References · 9

• 🔥 https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19 · Exploit
• https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c · Patch
• https://github.com/WebAssembly/binaryen/pull/8635 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-8257 · Security Note
• https://vuldb.com/vuln/362554 · Note
• https://vuldb.com/submit/809552 · Note
• https://github.com/WebAssembly/binaryen · Note
• https://vuldb.com/vuln/362554/cti · Note
• https://github.com/WebAssembly/binaryen/issues/8633 · Note