Remote code execution via use-after-free
Published Jul 3, 2026 · Updated Jul 3, 2026
Use after free in Microsoft Edge (Chromium-based) before 150.0.4078.48 allows remote attackers to execute code through crafted web content. Microsoft has not identified the affected component or disclosed which object is accessed after its lifetime ends, so the precise memory-lifetime error remains undisclosed. Exploitation requires a user to open attacker-controlled content and a high-complexity condition; successful exploitation runs code in the browser's security context.
Summary
What happened
Use after free in Microsoft Edge (Chromium-based) before 150.0.4078.48 allows remote attackers to execute code through crafted web content. Microsoft has not identified the affected component or disclosed which object is accessed after its lifetime ends, so the precise memory-lifetime error remains undisclosed. Exploitation requires a user to open attacker-controlled content and a high-complexity condition; successful exploitation runs code in the browser's security context.
The record
- CVE
- CVE-2026-58276
- Published
- Jul 3, 2026
- Updated
- Jul 3, 2026
- Vendor
- Microsoft
- Product
- Microsoft Edge (Chromium-based)
- Classifications
- CWE-416, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 3, 2026CVE publishedPublication date reported by the CVE source.
- Jul 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.0.0 <150.0.4078.48
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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