Memory disclosure or crash via unchecked ciphertext length
Published Apr 3, 2026 · Updated Apr 3, 2026
Out-of-bounds read in Apple macOS allows remote attackers to disclose process memory or crash software using Swift Crypto 4.0.0 through 4.3.0. OpenSSLXWingPrivateKeyImpl.decapsulate passes an attacker-controlled encapsulated key to a fixed-size 1120-byte C API without first checking its length. Reachability requires an application to initialize an HPKE.Recipient with the X-Wing ciphersuite and an untrusted short key; the over-read exposes adjacent readable memory or aborts the process under runtime protection.
Summary
What happened
Out-of-bounds read in Apple macOS allows remote attackers to disclose process memory or crash software using Swift Crypto 4.0.0 through 4.3.0. OpenSSLXWingPrivateKeyImpl.decapsulate passes an attacker-controlled encapsulated key to a fixed-size 1120-byte C API without first checking its length. Reachability requires an application to initialize an HPKE.Recipient with the X-Wing ciphersuite and an untrusted short key; the over-read exposes adjacent readable memory or aborts the process under runtime protection.
The record
- CVE
- CVE-2026-28815
- Published
- Apr 3, 2026
- Updated
- Apr 3, 2026
- Vendor
- Apple
- Product
- macOS
- Classifications
- CWE-125
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 3, 2026CVE publishedPublication date reported by the CVE source.
- Apr 3, 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=4.0.0 <4.3.1
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
- X-Wing malformed ciphertext-length decapsulation PoCproof of concept · demonstrated
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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