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CVE Vulnerability Details :
CVE-2026-8257
PUBLISHED
More InfoOfficial Page
Assigner-VulDB
Assigner Org ID-1af790b2-7ee1-4545-860a-a788eba489b5
View Known Exploited Vulnerability (KEV) details
Published At-11 May, 2026 | 00:30
Updated At-11 May, 2026 | 00:30
Rejected At-
▼CVE Numbering Authority (CNA)
WebAssembly Binaryen BrOn wasm-ir-builder.cpp makeBrOn assertion

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.

Affected Products
Vendor
WebAssembly
Product
Binaryen
CPEs
  • cpe:2.3:a:webassembly:binaryen:*:*:*:*:*:*:*:*
Modules
  • BrOn Parser
Versions
Affected
  • 117
Problem Types
TypeCWE IDDescription
CWECWE-617Reachable Assertion
Type: CWE
CWE ID: CWE-617
Description: Reachable Assertion
Metrics
VersionBase scoreBase severityVector
4.04.8MEDIUM
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
3.13.3LOW
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
3.03.3LOW
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
2.01.7N/A
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
Version: 4.0
Base score: 4.8
Base severity: MEDIUM
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
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/E:P/RL:O/RC:C
Version: 3.0
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
Version: 2.0
Base score: 1.7
Base severity: N/A
Vector:
AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
reporter
pwn3rd (VulDB User)
Timeline
EventDate
Advisory disclosed2026-05-10 00:00:00
VulDB entry created2026-05-10 02:00:00
VulDB entry last update2026-05-10 17:02:16
Event: Advisory disclosed
Date: 2026-05-10 00:00:00
Event: VulDB entry created
Date: 2026-05-10 02:00:00
Event: VulDB entry last update
Date: 2026-05-10 17:02:16
Replaced By
Rejected Reason
References
HyperlinkResource
https://vuldb.com/vuln/362554
vdb-entry
technical-description
https://vuldb.com/vuln/362554/cti
signature
permissions-required
https://vuldb.com/submit/809552
third-party-advisory
https://github.com/WebAssembly/binaryen/issues/8633
issue-tracking
https://github.com/WebAssembly/binaryen/pull/8635
issue-tracking
patch
https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19
exploit
patch
https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c
patch
https://github.com/WebAssembly/binaryen/
product
Hyperlink: https://vuldb.com/vuln/362554
Resource:
vdb-entry
technical-description
Hyperlink: https://vuldb.com/vuln/362554/cti
Resource:
signature
permissions-required
Hyperlink: https://vuldb.com/submit/809552
Resource:
third-party-advisory
Hyperlink: https://github.com/WebAssembly/binaryen/issues/8633
Resource:
issue-tracking
Hyperlink: https://github.com/WebAssembly/binaryen/pull/8635
Resource:
issue-tracking
patch
Hyperlink: https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19
Resource:
exploit
patch
Hyperlink: https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291c
Resource:
patch
Hyperlink: https://github.com/WebAssembly/binaryen/
Resource:
product
Details not found