CVE-2026-8388mediumCWE-119 CWE-787

Incorrect boundary conditions in the JavaScript Engine: JIT component

33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 6.5epss 0.2%

from disclosure to weapon65 days

Published on NVDMay 12

1st PoC+65d

exploitation probability

0.2%top 84% of all CVEs

observed exploitation

nono source reports it

1 public exploit(s)

Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

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

Affected products

Mozilla · Firefox Mozilla · Thunderbird

public PoCs found — 1

githubgithub.com/Sana-404/CVE-2026-8388-Mitigation-and-Detection★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References