CVE-2026-8389

HIGHNVD 7.37.3—

7.3

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

CVSS v3: 7.3
EG Score: 7.3(high)
EPSS: 17.1%
KEV: Not listed

Published

May 12, 2026

Last Modified

May 13, 2026

References (2)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=2036983
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2026-45/

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 13× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-21 22:43 UTCepss_batch
2026-05-20 22:38 UTCepss_batch
2026-05-20 12:58 UTCEG score recompute
2026-05-20 12:58 UTCGHSA enrichment
2026-05-20 11:22 UTCepss_batch

Frequently asked(5)

What is CVE-2026-8389?

CVE-2026-8389 is a high vulnerability published on May 12, 2026. JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.

When was CVE-2026-8389 disclosed?

CVE-2026-8389 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-8389 actively exploited?

CVE-2026-8389 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-8389?

CVE-2026-8389 has a CVSS v3 base score of 7.3 (NVD).

How do I remediate CVE-2026-8389?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8389, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-8389

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CVE-2026-8389

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(3)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-8389?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)