CVE-2026-8257A vulnerability was detected in WebAssembly Binaryen up to 117.
Updated under an hour ago ()
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It affects webassembly binaryen. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-617
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
webassembly binaryen webassembly:binaryen | through 117 | NVD |
References
- https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/Assertion_Failure_isRef_wasm_Type_getHeapType_commit_3ef8d19exploit
- https://github.com/WebAssembly/binaryen/product
- https://github.com/WebAssembly/binaryen/commit/1251efbc1ea471c1311d2726b2bbe061ff2a291cpatch
- https://github.com/WebAssembly/binaryen/issues/8633exploit, issue-tracking, third-party-advisory
- https://github.com/WebAssembly/binaryen/pull/8635mitigation, patch
- https://vuldb.com/submit/809552third-party-advisory, vdb-entry
- https://vuldb.com/vuln/362554third-party-advisory, vdb-entry
- https://vuldb.com/vuln/362554/ctipermissions-required, vdb-entry
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.