CVE-2026-16355
⛔ criticalSummary
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
CVSS Score
9.8
Critical
EPSS Score
0.4
Exploit Probability
Published Date
2026-07-21
First Seen: 2026-07-22
📊 Relative Risk Intelligence
This CVE is Very High Risk - more severe than 90.5% of all 338,292 vulnerabilities in our database.
#31,990
Top 10% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jul 22, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Total
Complete system compromise possible
🏆 Discovered By
Amy Burnett of OpenAI
SSVC data provided by
CISA
Last Modified
2026-07-24
Source
NVD 🔗
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE IDs (Weakness Types)