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    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.

    Published:May 11, 2026
    Last Modified:May 11, 2026
    EPS:May 11, 2026
    EPSS Score:0.00013
    CVSS Score:3.3

    Affected Products

    Vendor
    Webassembly
    Product
    Binaryen

    Exploits

    https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19https://github.com/WebAssembly/binaryen/issues/8633

    Common Weakness Enumeration

    CWE-617 Reachable Assertion

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2020-18382 (CVSS 6.5) — Heap-buffer-overflow in /src/wasm/wasm-binary.cpp in wasm::WasmBinaryBuilder::visitBlock(wasm::Block*) in Bina…
    CVE-2020-18378 (CVSS 6.5) — A NULL pointer dereference was discovered in SExpressionWasmBuilder::makeBlock in wasm/wasm-s-parser.c in Bina…
    CVE-2021-46055 (CVSS 5.5) — A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::WasmBinaryBuilder:…
    CVE-2021-46054 (CVSS 5.5) — A Denial of Service vulnerability exists in Binaryen 104 due to an assertion abort in wasm::WasmBinaryBuilder:…
    CVE-2021-46053 (CVSS 5.5) — A Denial of Service vulnerability exists in Binaryen 103. The program terminates with signal SIGKILL.…
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    CVE-2021-46050 (CVSS 5.5) — A Stack Overflow vulnerability exists in Binaryen 103 via the printf_common function.…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High