CVE-2026-8954
📛 CVE Title
Incorrect boundary conditions, integer overflow in the Audio/Video component
Description
Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- mozilla
- CVSS severity
- high
- CVSS score
- 7.5 / 10
- CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N- Effective score
- 7.5 / 10 HIGH source: CNA overview
- CWE(s)
- —
- Reserved
- 2026-05-19
- Published
- 2026-05-19 12:29 UTC
- Last updated
- 2026-05-19 17:10 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/8xxx/CVE-2026-8954.json
- Linked Threat
- CVE-2026-8954 — CVE-2026-8954
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
- 2026-05-19 14:16:51 UTC
- NVD last modified
- 2026-05-19 18:42:57 UTC
- NVD CVSS v3.1
- 7.5 / 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:H/I:N/A:N- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.6 / 10
- EPSS score
- 0.0003 (probability of exploitation in next 30 days)
- EPSS percentile
- 10.21% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24
NVD-assigned CWE(s):
CWE-119
(differs from the CNA list above)
NVD / KEV / EPSS data refreshed 2026-05-25 00:33 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-2026-30906 - Assigner
- mozilla
- Published
- May 19, 2026, 12:29:48 PM
- Updated
- May 19, 2026, 5:10:48 PM
- EUVD base score (CVSS 3.1)
-
7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EUVD-reported EPSS
- 0.0400
- Aliases
-
GHSA-4g4m-32hr-qwg6
ENISA description: Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
EUVD references (5)
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| Mozilla | Firefox |
140.11 (unaffected),
151 (unaffected)
|
— |
| Mozilla | Thunderbird |
140.11 (unaffected),
151 (unaffected)
|
— |
Affected products — CPE 2.3 (3) 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:*:*:*:*:esr:*:*:*cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
Vendor references (5)
References embedded in the original CVE record by the assigning CNA.
Web references (14)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- http://www.mozilla.org/security/announce/2026/mfsa2026-51.html rapid7:www.mozilla.org
- http://www.mozilla.org/security/announce/2026/mfsa2026-48.html rapid7:www.mozilla.org
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30906 rapid7:euvd.enisa.europa.eu
- http://cwe.mitre.org/data/definitions/119.html rapid7:cwe.mitre.org
- https://attackerkb.com/topics/CVE-2026-8954 rapid7:attackerkb.com
- http://www.mozilla.org/security/announce/2026/mfsa2026-46.html rapid7:www.mozilla.org
- https://www.first.org/epss/ tenable:www.first.org
- https://www.mozilla.org/security/advisories/mfsa2026-46/ tenable:www.mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-48/ tenable:www.mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-50/ tenable:www.mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-51/ tenable:www.mozilla.org
- https://bugzilla.mozilla.org/show_bug.cgi?id=2030747 tenable:bugzilla.mozilla.org
- https://nvd.nist.gov/vuln/detail/CVE-2026-8954 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-8954 tenable:www.cve.org
NVD-tagged references (5)
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=2030747 security@mozilla.org Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-46/ security@mozilla.org Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-48/ security@mozilla.org Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-50/ security@mozilla.org Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-51/ security@mozilla.org Vendor Advisory
Remediations (17)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:betanews.com
Another month, another update for Windows which is problematic. This time around, it is the May 2026 Windows 11 security update - or the KB5089549 update.
2026-05-23 22:18 UTC -
web:cyberpress.org
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .
2026-05-23 22:18 UTC -
web:nvd.nist.gov
An official website of the United States government Here's how you know
2026-05-23 22:18 UTC -
web:support.microsoft.com
This cumulative update for Windows 11, version 25H2 and 24H2 (KB5089549) includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the Windows release health dashboard for the latest status on this release.
2026-05-23 22:18 UTC -
web:thewincentral.com
KB5089549 Known Issue Rollback policy The mitigation temporarily disables the problematic change causing the update failure. Affected enterprise devices must also be restarted after applying the Group Policy. Permanent Fix Is Coming Later Microsoft says a full resolution is currently in development and will arrive in a future Windows update.
2026-05-23 22:18 UTC -
web:windowsreport.com
Microsoft has released its May 2026 Patch Tuesday updates for Windows 11 and Windows 10, shipping as KB5089549 and KB5087544. The updates include fixes for more than 130 security vulnerabilities across Windows, Office, SharePoint, DNS components, and core system services, as Bleeping Computer writes. While no publicly disclosed zero-day vulnerabilities were reported this month, the […]
2026-05-23 22:18 UTC -
web:www.anavem.com
KB5089548 — May 2026 Security Update for Windows 11 version 26H1 KB5089548 is a May 2026 security update that addresses multiple vulnerabilities in Windows 11 version 26H1, including critical fixes for Windows Kernel, Microsoft Edge WebView2, and Windows Graphics components.
2026-05-23 22:18 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's May 2026 Patch Tuesday, with security updates for 120 flaws and no zero-days disclosed this month.
2026-05-23 22:18 UTC -
web:www.rapid7.com
vulnerability MFSA2026-46 Firefox: Security Vulnerabilities fixed in Firefox 151 ( CVE-2026-8954 )
2026-05-23 22:18 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 .
2026-05-23 22:18 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 02:58 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.
2026-05-26 02:58 UTC -
web:www.crowdstrike.com
Microsoft has released security updates for 130 vulnerabilities, including 30 critical, in its May 2026 Patch Tuesday rollout.
2026-05-26 02:58 UTC -
web:www.majorgeeks.com
But if you're not so fortunate, here's what you can do to fix this mess. Apply Known Issue Rollback (KIR) The Windows release health page has finally acknowledged the issue, after a slight delay. However, it only mentions installation failures, not the other problems users have complained about. But we'll take what we can get, I guess.
2026-05-26 02:58 UTC -
web:www.mozilla.org
Description Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
2026-05-26 02:58 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 02:58 UTC -
web:www.windowscentral.com
Microsoft confirms that the Windows 11 May 2026 update fails with error 0x800f0922 on some computers, but a rollback and a fix are already available.
2026-05-26 02:58 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-8954.json.
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