App crash via Quick Look out-of-bounds write
Published May 11, 2026 · Updated May 11, 2026
Out-of-bounds write in Quick Look in Apple iOS, iPadOS, and macOS allows attackers to crash an app via a malicious file. Apple identifies deficient input validation but has not disclosed the affected parser path, file format, or exact unchecked value that causes the write beyond its intended bounds. The vulnerable Quick Look parser must process attacker-controlled file content; Apple reports app termination and does not describe system compromise or code execution.
Summary
What happened
Out-of-bounds write in Quick Look in Apple iOS, iPadOS, and macOS allows attackers to crash an app via a malicious file. Apple identifies deficient input validation but has not disclosed the affected parser path, file format, or exact unchecked value that causes the write beyond its intended bounds. The vulnerable Quick Look parser must process attacker-controlled file content; Apple reports app termination and does not describe system compromise or code execution.
The record
- CVE
- CVE-2026-43656
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Vendor
- Apple
- Product
- iOS and iPadOS
- Classifications
- CWE-787, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 11, 2026CVE publishedPublication date reported by the CVE source.
- May 11, 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 <18.7.9
- Affected versionversion=0 <26.5
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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