CVE-2026-8968

HIGH

Published May 19, 2026 Modified May 20, 2026 CWE-400

Description

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0041

Probability of exploitation

0.33%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 140.11.0
mozilla	firefox	< 151.0.0
mozilla	thunderbird	< 140.11
mozilla	thunderbird	< 151.0.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2026-46/ https://www.mozilla.org/security/advisories/mfsa2026-48/ https://www.mozilla.org/security/advisories/mfsa2026-50/ https://www.mozilla.org/security/advisories/mfsa2026-51/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2030467

Frequently Asked Questions

What is CVE-2026-8968? +

Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-8968? +

CVE-2026-8968 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0041, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-8968? +

CVE-2026-8968 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-8968? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-45802

FPDI is a collection of PHP classes that facilitate reading pages from existing PDF documents and using them as templates …

CVE-2026-42343

FastGPT is an AI Agent building platform. In versions 4.14.13 and prior, the code-sandbox component suffers from insufficient resource isolation …

CVE-2025-41361

Uncontrolled resource consumption vulnerability in IDF v0.10.0-0C03-03 and ZLF v0.10.0-0C03-04. The devices improperly handle TLS requests associated with PROCOME sockets, …

CVE-2025-41360

Uncontrolled resource consumption vulnerability in IDF v0.10.0-0C03-03 and ZLF v0.10.0-0C03-04. The device is vulnerable to a packet flooding denial of …

CVE-2024-5422

An uncontrolled resource consumption of file descriptors in SEH Computertechnik utnserver Pro, SEH Computertechnik utnserver ProMAX, SEH Computertechnik INU-100 allows …

CVE-2025-50057

A DOS vulnerability in RSFiles! component 1.16.3-1.17.7 Joomla was discovered. The issue allows unauthenticated remote attackers to deny access to …

Quick Facts

CVSS Score: 7.5
Severity: HIGH
EPSS: 0.0041
Published: May 19, 2026

Scan for this vulnerability

Check if your website or infrastructure is affected by CVE-2026-8968.

Website Scan Port Scan

Browse CVEs

Critical High CISA KEV ! Most likely exploited →