CVE-2026-8090

⚠️ high

Summary

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

CVSS Score

7.3

High

EPSS Score

0.0

Exploit Probability

Published Date

2026-05-07

First Seen: 2026-05-10

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 55.6% of all 321,361 vulnerabilities in our database.

#142,783

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: May 7, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

Kevin Brosnan

SSVC data provided by CISA

Last Modified 2026-05-08

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-416

📦 Affected Products 5

Vendor	Product	Status	Affected Versions
mozilla	firefox	Affected	< 115.35.2
mozilla	firefox	Affected	> 128.0 < 140.10.2
mozilla	firefox	Affected	< 150.0.2
mozilla	thunderbird	Affected	< 140.10.2
mozilla	thunderbird	Affected	< 150.0.2

🔗 References 6

https://bugzilla.mozilla.org/show_bug.cgi?id=2034352

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2026...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-8390	⚠️ high	7.3	0.0	Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.	2026-05-12
CVE-2026-8401	⛔ critical	9.8	0.1	Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3.	2026-05-12
CVE-2026-8091	⛔ critical	9.8	0.0	Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thund...	2026-05-07
CVE-2026-8092	⚠️ high	8.1	0.0	Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. Some of these bugs showed ...	2026-05-07
CVE-2026-8093	⚠️ high	8.1	0.0	Memory safety bugs present in Firefox 150.0.1. Some of these bugs showed evidence of memory corruption and we presume th...	2026-05-07
CVE-2026-8094	⛔ critical	9.8	0.0	Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.	2026-05-07

These CVEs affect the same products