Is CVE-2026-8257 in the CISA KEV catalog?

No. CVE-2026-8257 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-8257?

CVE-2026-8257 has a CVSS v3 base score of 3.3 (LOW).

What is the EPSS score for CVE-2026-8257?

CVE-2026-8257 has an EPSS score of 0.16% (5th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2026-8257?

No published fix for CVE-2026-8257 has been found yet. Check the linked vendor advisories for guidance as it becomes available.

CVE & CISA-KEV Catalog

CVE-2026-8257

LOW

3.3

CVSS v3

NVD

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.

CWE-617

How to fix

No published remediation has been found for this vulnerability's affected products yet.

Mitigation guidance may be in the linked vendor advisories in the References section below.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

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 Intelligence

0.16%probability of exploitation in 30 days

5thpercentile

Low risk: more likely to be exploited than 5% of all known CVEs.

References

Patch2

Exploit2

Third-Party Advisory2

VDB Entry1

vuldb.com

Product1

github.com

Embed a live status badge for CVE-2026-8257

Markdown

[![CVE-2026-8257](https://tridentstack.com/cve/badge/CVE-2026-8257.svg)](https://tridentstack.com/cve/CVE-2026-8257)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-8257"><img src="https://tridentstack.com/cve/badge/CVE-2026-8257.svg" alt="CVE-2026-8257"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-21.