CVE-2026-8389
📛 CVE Title
JIT miscompilation in the JavaScript Engine: JIT component
Description
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- mozilla
- CVSS severity
- high
- CVSS score
- 7.3 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Effective score
- 7.3 / 10 HIGH source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-05-12
- Published
- 2026-05-12 14:36 UTC
- Last updated
- 2026-05-13 17:50 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8389.json
- Linked Threat
- CVE-2026-8389 — CVE-2026-8389
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-12 14:17:11 UTC
- NVD last modified
- 2026-05-13 17:23:05 UTC
- NVD CVSS v3.1
- 7.3 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.4 / 10
- EPSS score
- 0.0005 (probability of exploitation in next 30 days)
- EPSS percentile
- 16.80% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-119,
CWE-686,
CWE-843
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-25 06:16 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-29464 - Assigner
- mozilla
- Published
- May 12, 2026, 12:36:12 PM
- Updated
- May 13, 2026, 3:50:14 PM
- EUVD base score (CVSS 3.1)
-
7.3 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L - EUVD-reported EPSS
- 0.0500
- Vendors
- Mozilla
- Products
-
Firefox
ENISA description: JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Mozilla | Firefox |
150.0.3 (unaffected)
|
— |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Vendor references (2)
References embedded in the original CVE record by the assigning CNA.
MITRE references (2) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
Web references (9)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-29464 rapid7:euvd.enisa.europa.eu
- http://cwe.mitre.org/data/definitions/119.html rapid7:cwe.mitre.org
- http://cwe.mitre.org/data/definitions/843.html rapid7:cwe.mitre.org
- http://www.mozilla.org/security/announce/2026/mfsa2026-45.html rapid7:www.mozilla.org
- https://attackerkb.com/topics/CVE-2026-8389 rapid7:attackerkb.com
- http://cwe.mitre.org/data/definitions/686.html rapid7:cwe.mitre.org
- https://www.cve.org/CVERecord?id=CVE-2026-8389 tenable:www.cve.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-8389 tenable:nvd.nist.gov
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (2)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://bugzilla.mozilla.org/show_bug.cgi?id=2036983 security@mozilla.org Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-45/ security@mozilla.org Vendor Advisory
Remediations (16)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.
2026-05-23 20:57 UTC -
web:krebsonsecurity.com
Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.
2026-05-23 20:57 UTC -
web:nvd.nist.gov
An official website of the United States government Here's how you know
2026-05-23 20:57 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-05-23 20:57 UTC -
web:windowsforum.com
Microsoft's April 2026 Patch Tuesday lands as one of the busiest security releases in recent memory, with 163 vulnerabilities closed across Windows, Office, SharePoint, .NET, Visual Studio, Dynamics 365, SQL Server, Azure, Defender Antimalware Platform, PowerShell, and related services. The...
2026-05-23 20:57 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
2026-05-23 20:57 UTC -
web:www.crowdstrike.com
Microsoft's April 2026 Patch Tuesday addresses 164 CVEs , featuring 8 Critical vulnerabilities, one exploited zero-day, and one disclosed zero-day.
2026-05-23 20:57 UTC -
web:www.pcworld.com
This month's Patch Tuesday includes an actively exploited Office zero-day vulnerability and several critical RCE bugs in Windows and Remote Desktop.
2026-05-23 20:57 UTC -
web:www.techrepublic.com
Microsoft's April 2026 Patch Tuesday fixes 165 vulnerabilities, including two zero-days, in one of the company's largest monthly security updates.
2026-05-23 20:57 UTC -
web:www.windowslatest.com
Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.
2026-05-23 20:57 UTC -
web:community.ui.com
Published: May 21, 2026 Updated: May 22, 2026 Version: 1.1 Revision: 1.1 Summary 1 of 5 A malicious actor with access to the network and high privileges could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection. Affected Products: UniFi OS Server (Version 5.0.6 and earlier) Mitigation : Update your UniFi OS Server to Version 5.0.8 or later ...
2026-05-26 02:51 UTC -
web:techcommunity.microsoft.com
We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE - 2026 -42897.
2026-05-26 02:51 UTC -
web:www.forbes.com
Updated May 17: This article, originally published May 16, has been updated to include further details on the emergency mitigation process recommended after the CVE - 2026 -42897 Microsoft Exchange ...
2026-05-26 02:51 UTC -
web:www.oracle.com
This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.
2026-05-26 02:51 UTC -
web:www.sentinelone.com
CVE - 2026 -28389 is a denial of service vulnerability in OpenSSL CMS processing. Learn about its impact, affected versions, and mitigation methods.
2026-05-26 02:51 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-05-26 02:51 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-8389.json.
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