Code execution via conditional DFG register allocation
Published Nov 19, 2024 · Updated Apr 2, 2026
Code execution in JavaScriptCore across affected Apple products allows remote attackers to run arbitrary code via malicious web content. SpeculativeJIT::compilePutByValForIntTypedArray allocates a DFG scratch register only after a slow path, leaving inconsistent global register state when that path executes. A user must process attacker-controlled web content; the public proof of concept exercises growable SharedArrayBuffer typed-array stores, and exploitation was observed on Intel-based Macs.
Summary
What happened
Code execution in JavaScriptCore across affected Apple products allows remote attackers to run arbitrary code via malicious web content. SpeculativeJIT::compilePutByValForIntTypedArray allocates a DFG scratch register only after a slow path, leaving inconsistent global register state when that path executes. A user must process attacker-controlled web content; the public proof of concept exercises growable SharedArrayBuffer typed-array stores, and exploitation was observed on Intel-based Macs.
The record
- CVE
- CVE-2024-44308
- Published
- Nov 19, 2024
- Updated
- Apr 2, 2026
- Vendor
- Apple
- Product
- iOS
- Classifications
- T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 19, 2024Exploitation reportedApple report of active exploitation on Intel-based Macs
- Nov 19, 2024CVE publishedPublication date reported by the CVE source.
- Nov 21, 2024Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
- Apr 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <17.7
- Affected versionversion=18.0 <18.1
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.
Weakness, pattern, technique
Public exploit references
- JavaScriptCore DFG register-allocation proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Apple report of active exploitation on Intel-based Macsreported exploitation
- CISA Known Exploited Vulnerabilities catalog entryknown exploited catalog
Technologies
Your stack
See the directory against your own environment.
Your stack
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