LOW
CVE-2026-8257
CWE-617Published: May 11, 2026· Updated: May 13, 2026
3.3
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.1th
Official 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.
Technical Analysis
CVE-2026-8257 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (8)
Quick Facts
CVE IDCVE-2026-8257
CVSS Score3.3 / 10
SeverityLOW
WeaknessCWE-617
CISA KEVNo
EPSS (30d)0.01%
PublishedMay 11, 2026
Related CVEs (CWE-617)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-8257 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.