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Security Vulnerabilities fixed in Firefox ESR 140.17 — Mozilla

🗓️ 29 Sep 2026 00:00:00Reported by Mozilla FoundationType 
mozilla
 mozilla
🔗 www.mozilla.org👁 4 Views

Multiple high impact flaws in Firefox ESR including sandbox escapes and use-after-free.

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Vulners
Node
mozillafirefoxRange<140.17esr

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29 Sep 2026 00:00Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.19.6
EPSS0.0032
SSVC
4