CVE-20XX-?

CVE-2026-4690

8.6 HIGH 0.8% exploit odds Fix listed Memory safety Browser & mail

What it is

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

At a glance

Exploitability
Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds
0.8% chance of exploitation in the next 30 days (EPSS).
Fix
A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

  1. PublishedDisclosed publicly on CVE.org and NVD
  2. Last updatedMost recent change to the record

Details

Published
Last modified
Exploit probability
0.8% · EPSS, next 30 days
Weakness
CWE-190 · Integer overflow
Record status
Modified

Affected

Attack profile CVSS 3.1 · 8.6

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Raw vector

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

Meme: I wake up, CVE-2026-4690
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Fix and advisories

References

NVD record · CVE.org record