Remote sandbox escape via unchecked WebGPU buffer length
Published Jun 23, 2023 · Updated Jan 12, 2026
A WebKit bounds-checking flaw in Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari allows remote attackers to escape its sandbox. RemoteBuffer::unmap in the WebGPU GPU process accepted a data vector larger than the currently mapped buffer because it checked only that a mapping existed. A compromised Web Content process can therefore overwrite beyond the mapped range and cross the sandbox boundary, while Apple reports active exploitation.
Summary
What happened
A WebKit bounds-checking flaw in Apple iOS, iPadOS, macOS, tvOS, watchOS, and Safari allows remote attackers to escape its sandbox. RemoteBuffer::unmap in the WebGPU GPU process accepted a data vector larger than the currently mapped buffer because it checked only that a mapping existed. A compromised Web Content process can therefore overwrite beyond the mapped range and cross the sandbox boundary, while Apple reports active exploitation.
The record
- CVE
- CVE-2023-32409
- Published
- Jun 23, 2023
- Updated
- Jan 12, 2026
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- CWE-125, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 23, 2023CVE publishedPublication date reported by the CVE source.
- Jan 12, 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=unspecified <15.7
- Affected versionversion=unspecified <16.5
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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Reported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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