Memory corruption via ImageIO bounds error
Published Aug 21, 2025 · Updated Apr 2, 2026
Out-of-bounds write in Apple ImageIO in affected iOS, iPadOS, and macOS releases allows attackers to corrupt memory via a malicious image file. A public proof of concept alters DNG SubIFD SamplesPerPixel data and an SOF3 component count to reach a suspected JPEG lossless decoder bounds mismatch; Apple has not disclosed the exact faulty operation. Processing the crafted image is the gate, and exploitation has been reported in targeted attacks; the documented standalone consequence is memory corruption.
Summary
What happened
Out-of-bounds write in Apple ImageIO in affected iOS, iPadOS, and macOS releases allows attackers to corrupt memory via a malicious image file. A public proof of concept alters DNG SubIFD SamplesPerPixel data and an SOF3 component count to reach a suspected JPEG lossless decoder bounds mismatch; Apple has not disclosed the exact faulty operation. Processing the crafted image is the gate, and exploitation has been reported in targeted attacks; the documented standalone consequence is memory corruption.
The record
- CVE
- CVE-2025-43300
- Published
- Aug 21, 2025
- Updated
- Apr 2, 2026
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 21, 2025CVE publishedPublication date reported by the CVE source.
- Apr 2, 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=0 <15.8.5
- Affected versionversion=0 <16.7.12
- Affected versionversion=0 <18.6.2
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
- iOS 18.6.1 0-click RCE POCproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog entryknown exploited catalog
- Apple targeted-attack exploitation reportreported exploitation
Technologies
Your stack
See the directory against your own environment.
Your stack
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