Code execution via unchecked WebAssembly data count
Published Aug 14, 2023 · Updated Oct 21, 2025
Out-of-bounds access in JavaScriptCore on affected Apple products allows remote attackers to execute code through crafted web content. The WebAssembly parser accepted an oversized Data Count and failed to require it to match the Data section, letting malformed modules escape the intended segment bounds. Reaching the flaw requires processing attacker-controlled web content; successful exploitation runs code in the WebKit content-process context.
Summary
What happened
Out-of-bounds access in JavaScriptCore on affected Apple products allows remote attackers to execute code through crafted web content. The WebAssembly parser accepted an oversized Data Count and failed to require it to match the Data section, letting malformed modules escape the intended segment bounds. Reaching the flaw requires processing attacker-controlled web content; successful exploitation runs code in the WebKit content-process context.
The record
- CVE
- CVE-2022-48503
- Published
- Aug 14, 2023
- Updated
- Oct 21, 2025
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- CWE-129, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 14, 2023CVE publishedPublication date reported by the CVE source.
- Oct 20, 2025Exploitation reportedCISA Known Exploited Vulnerabilities Catalog listing
- 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 <15.6
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog listingknown exploited catalog
- Coruna iOS exploit chainexploit chain
Technologies
Your stack
See the directory against your own environment.
Your stack
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