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NVD Vulnerability Details :
CVE-2026-8257
Analyzed
More InfoOfficial Page
Source-cna@vuldb.com
View Known Exploited Vulnerability (KEV) details
Published At-11 May, 2026 | 02:16
Updated At-21 May, 2026 | 17:59

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.01.9LOW
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.13.3LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Primary3.15.5MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Secondary2.01.7LOW
AV:L/AC:L/Au:S/C:N/I:N/A:P
Type: Secondary
Version: 4.0
Base score: 1.9
Base severity: LOW
Vector:
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Type: Primary
Version: 3.1
Base score: 5.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Type: Secondary
Version: 2.0
Base score: 1.7
Base severity: LOW
Vector:
AV:L/AC:L/Au:S/C:N/I:N/A:P
CPE Matches
webassembly
webassembly
>>binaryen>>Versions up to 117(inclusive)
cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-617Primarycna@vuldb.com
CWE ID: CWE-617
Type: Primary
Source: cna@vuldb.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19cna@vuldb.com
Exploit
https://github.com/WebAssembly/binaryen/cna@vuldb.com
Product
https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291ccna@vuldb.com
Patch
https://github.com/WebAssembly/binaryen/issues/8633cna@vuldb.com
Exploit
Issue Tracking
Third Party Advisory
https://github.com/WebAssembly/binaryen/pull/8635cna@vuldb.com
Mitigation
Patch
https://vuldb.com/submit/809552cna@vuldb.com
Third Party Advisory
VDB Entry
https://vuldb.com/vuln/362554cna@vuldb.com
Third Party Advisory
VDB Entry
https://vuldb.com/vuln/362554/cticna@vuldb.com
Permissions Required
VDB Entry
Hyperlink: https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19
Source: cna@vuldb.com
Resource:
Exploit
Hyperlink: https://github.com/WebAssembly/binaryen/
Source: cna@vuldb.com
Resource:
Product
Hyperlink: https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c
Source: cna@vuldb.com
Resource:
Patch
Hyperlink: https://github.com/WebAssembly/binaryen/issues/8633
Source: cna@vuldb.com
Resource:
Exploit
Issue Tracking
Third Party Advisory
Hyperlink: https://github.com/WebAssembly/binaryen/pull/8635
Source: cna@vuldb.com
Resource:
Mitigation
Patch
Hyperlink: https://vuldb.com/submit/809552
Source: cna@vuldb.com
Resource:
Third Party Advisory
VDB Entry
Hyperlink: https://vuldb.com/vuln/362554
Source: cna@vuldb.com
Resource:
Third Party Advisory
VDB Entry
Hyperlink: https://vuldb.com/vuln/362554/cti
Source: cna@vuldb.com
Resource:
Permissions Required
VDB Entry
Change History
0Changes found
Details not found