Mozilla: >> Firefox >> 31.0 Security Vulnerabilities
Memory safety bugs present in Firefox 149 and Thunderbird 149. 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. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
7.5
EPSS Score
0.0
Published
2026-04-21
Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
CVSS Score
7.5
EPSS Score
0.0
Published
2026-04-21
Denial-of-service due to integer overflow in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
7.5
EPSS Score
0.0
Published
2026-04-21
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
5.4
EPSS Score
0.0
Published
2026-04-21
Incorrect boundary conditions in the WebRTC component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-21
Incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
CVSS Score
7.8
EPSS Score
0.0
Published
2026-04-21
Other issue in the Networking: DNS component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-21
Invalid pointer in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
5.3
EPSS Score
0.0
Published
2026-04-21
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
5.3
EPSS Score
0.001
Published
2026-04-21
Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150 and Thunderbird 150.
CVSS Score
7.5
EPSS Score
0.0
Published
2026-04-21
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