What’s Vulnerable › Vulnerabilities

CVE-2025-9182: Denial-of-service due to out-of-memory in the Graphics: WebRender component

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-19 · updated 2026-09-30
• Weakness: CWE-400

Description

Denial-of-service due to out-of-memory in the Graphics: WebRender component. This vulnerability was fixed in Firefox 142, Firefox ESR 140.2, Thunderbird 142, and Thunderbird 140.2.

Affected products

• Mozilla Firefox: before 140.2.0; before 142.0 — fixed in 140.2.0, 142.0
• Mozilla Thunderbird: before 140.2.0; before 142.0 — fixed in 140.2.0, 142.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 140.2.0, 142.0; Mozilla Thunderbird 140.2.0, 142.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1975837
• https://www.mozilla.org/security/advisories/mfsa2025-64/
• https://www.mozilla.org/security/advisories/mfsa2025-67/
• https://www.mozilla.org/security/advisories/mfsa2025-70/
• https://www.mozilla.org/security/advisories/mfsa2025-72/

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