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CVE-2026-8257— WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

Quick assessment

Affected
WebAssembly Binaryen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Binaryen是WebAssembly开源的一款使用C++编写的用于WebAssembly的编译器基础结构和工具链库。 Binaryen 117及之前版本存在安全漏洞，该漏洞源于BrOn Parser组件中文件src/wasm/wasm-ir-builder.cpp的函数IRBuilder::makeBrOn存在可达断言问题。

CVSS 3.3 · Low EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
WebAssembly Binaryen 117 affected
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I. Basic Information for CVE-2026-8257

Vulnerability Information
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Vulnerability Title
WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
Binaryen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Binaryen是WebAssembly开源的一款使用C++编写的用于WebAssembly的编译器基础结构和工具链库。 Binaryen 117及之前版本存在安全漏洞，该漏洞源于BrOn Parser组件中文件src/wasm/wasm-ir-builder.cpp的函数IRBuilder::makeBrOn存在可达断言问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WebAssembly Binaryen 117 cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-8257

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III. Intelligence Information for CVE-2026-8257

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Patches & Fixes for CVE-2026-8257 (3)

Vendor Advisories for CVE-2026-8257 (2)

Proof of Concept for CVE-2026-8257 (1)

Vendor Pages for CVE-2026-8257 (1)

IV. Related Vulnerabilities

Same product: Binaryen
Same vendor: WebAssembly
Same weakness: CWE-617

V. Comments for CVE-2026-8257

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