Windows apps · Application version · July 7, 2025

Microsoft Edge Dev 140.0.3421.0

Microsoft Edge Dev 140.0.3421.0, released July 7, 2025, fixes 14 CVEs in Microsoft Edge Dev. None of them is reported as exploited. Patch Radar priority: Urgent. The latest Microsoft Edge Dev is 159.0.4393.0, which also fixes every one of these CVEs.

Urgent

Superseded. The latest Microsoft Edge Dev is 159.0.4393.0, which also fixes every CVE on this page. Install that instead.

CVEs closed

2 rated Critical

Exploited

None reported

Highest CVSS

9.6

Base score, 0 to 10

Highest EPSS

0.0742

94th percentile

Priority of the 14 CVEs

Patch now 0
                                Urgent 2
                                High 5
                                Routine 7

Applies to

Product	Version
Microsoft Edge Dev	140.0.3421.0

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2025-9478	Chromium: CVE-2025-9478 Use after free in ANGLE	9.6	0.0742	None reported
Urgent	CVE-2025-8901	Chromium: CVE-2025-8901 Out of bounds write in ANGLE	9.6	0.0034	None reported
High	CVE-2025-8578	Chromium: CVE-2025-8578 Use after free in Cast	8.8	0.0036	None reported
High	CVE-2025-8576	Chromium: CVE-2025-8576 Use after free in Extensions	8.8	0.0034	None reported
High	CVE-2025-8879	Chromium: CVE-2025-8879 Heap buffer overflow in libaom	8.8	0.0030	None reported
High	CVE-2025-8880	Chromium: CVE-2025-8880 Race in V8	8.8	0.0028	None reported
High	CVE-2025-8882	Chromium: CVE-2025-8882 Use after free in Aura	8.8	0.0027	None reported
Routine	CVE-2025-8581	Chromium: CVE-2025-8581 Inappropriate implementation in Extensions	4.3	0.0030	None reported
Routine	CVE-2025-8577	Chromium: CVE-2025-8577 Inappropriate implementation in Picture In Picture	4.3	0.0026	None reported
Routine	CVE-2025-8579	Chromium: CVE-2025-8579 Inappropriate implementation in Gemini Live in Chrome	4.3	0.0026	None reported
Routine	CVE-2025-8580	Chromium: CVE-2025-8580 Inappropriate implementation in Filesystems	4.3	0.0026	None reported
Routine	CVE-2025-8582	Chromium: CVE-2025-8582 Insufficient validation of untrusted input in DOM	4.3	0.0026	None reported
Routine	CVE-2025-8881	Chromium: CVE-2025-8881 Inappropriate implementation in File Picker	6.5	0.0026	None reported
Routine	CVE-2025-8583	Chromium: CVE-2025-8583 Inappropriate implementation in Permissions	4.3	0.0024	None reported

Other Microsoft Edge Dev versions with security fixes

Microsoft Edge Dev 157.0.4322.0
Microsoft Edge Dev
Microsoft Edge Dev 156.0.4285.0
Microsoft Edge Dev
Microsoft Edge Dev 155.0.4273.0
Microsoft Edge Dev
Microsoft Edge Dev 154.0.4238.0
Microsoft Edge Dev
Microsoft Edge Dev 153.0.4224.0
Microsoft Edge Dev
Microsoft Edge Dev 152.0.4167.0
Microsoft Edge Dev

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