Sensitive information disclosure via RegExp position errors
Published Jun 23, 2023 · Updated Oct 21, 2025
An out-of-bounds read in WebKit in Apple operating systems and Safari allows remote attackers to disclose sensitive information through web content. JavaScriptCore's RegExpGlobalData::performMatch mishandles string positions for non-BMP characters during regular-expression assertions and empty matches, reading beyond bounds. Exploitation requires a user to process attacker-controlled web content, and the reported consequence is information disclosure rather than modification or service interruption.
Summary
What happened
An out-of-bounds read in WebKit in Apple operating systems and Safari allows remote attackers to disclose sensitive information through web content. JavaScriptCore's RegExpGlobalData::performMatch mishandles string positions for non-BMP characters during regular-expression assertions and empty matches, reading beyond bounds. Exploitation requires a user to process attacker-controlled web content, and the reported consequence is information disclosure rather than modification or service interruption.
The record
- CVE
- CVE-2023-28204
- Published
- Jun 23, 2023
- Updated
- Oct 21, 2025
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- CWE-125, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 23, 2023CVE publishedPublication date reported by the CVE source.
- Oct 21, 2025Record 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?
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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