CVE-2026-16355: 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 14
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-16355
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-163550.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-16355 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Mozilla Thunderbird (July 23, 2026)cert-fr-avis
- unknownMozilla Products Multiple Vulnerabilitieshkcert
- unknownDSA-6394-1 firefox-esr - security updatedebian
Recent advisories for JIT miscompilation in
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- criticalCVE-2026-16410: JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Fi…nvd · 2026-07-21
- unknownCVE-2026-16392: JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Fi…nvd · 2026-07-21
- criticalCVE-2026-16363: JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in F…nvd · 2026-07-21
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