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CVE WatchJul 21, 2026

CVE-2026-16361

Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. Some of these bugs showed evidence of memory corruption and we pres

CVSS

9.8

Critical

EPSS

—

KEV

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Exploit Today

0

0-100

Published: Jul 21, 2026 · Last modified: Jul 21, 2026 · CWE-119

EPSS · 30d

Not enough EPSS history yet.

Technical description

Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox ESR 115.38 and Firefox ESR 140.13.

Official references
Related CVEs
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——0Memory safety bugs present in Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.1dCVE-2026-164119.8 CRI
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——0Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.6hCVE-2026-1636710.0 CRI
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——0Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153.6hCVE-2026-163649.1 CRI
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——0Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 153.6hCVE-2026-163609.8 CRI
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——0Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.6h