Vulnerability Monitor

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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.

Security Impact Summary

This vulnerability carries a LOW severity rating with a CVSS v3.1 score of 3.3, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and limited availability for affected systems. Impacting 1 product from webassembly organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2026, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2026-05-11T02:16:27.090

Last Modified

2026-07-23T20:10:00.130

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 3.3 (LOW)

CVSSv2 Vector

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

Access Vector: LOCAL
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

3.1

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-617

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	webassembly	binaryen	≤ 117	Yes

References

https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19 Exploit ([email protected])
https://github.com/WebAssembly/binaryen/ Product ([email protected])
https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c Patch ([email protected])
https://github.com/WebAssembly/binaryen/issues/8633 Exploit, Issue Tracking, Third Party Advisory ([email protected])
https://github.com/WebAssembly/binaryen/pull/8635 Mitigation, Patch ([email protected])
https://vuldb.com/submit/809552 Third Party Advisory, VDB Entry ([email protected])
https://vuldb.com/vuln/362554 Third Party Advisory, VDB Entry ([email protected])
https://vuldb.com/vuln/362554/cti Permissions Required, VDB Entry ([email protected])

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For webassembly's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.