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Security Vulnerabilities fixed in Firefox ESR 115.39 — Mozilla

🗓️ 18 Aug 2026 00:00:00Reported by Mozilla FoundationType 
mozilla
 mozilla
🔗 www.mozilla.org👁 4 Views

Firefox ESR 115.39, 140.13 and Firefox 153 patch internally found security bugs including memory corruption risks.

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CVE-2026-74934
19 Aug 202604:45
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CVE-2026-74935
19 Aug 202604:45
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CVE-2026-74939
19 Aug 202604:45
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CVE-2026-74940
19 Aug 202604:45
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CVE-2026-74942
19 Aug 202604:45
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CVE-2026-74943
17 Aug 202615:43
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CVE-2026-74945
17 Aug 202615:43
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CVE-2026-74946
19 Aug 202604:45
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CVE-2026-74948
19 Aug 202604:45
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CVE-2026-74934
18 Aug 202612:23
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mozillafirefoxRange<115.39esr

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18 Aug 2026 00:00Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.18.8
SSVC
4