Kernel-memory disclosure via unchecked WebDAV reply length
Published Jul 27, 2026 · Updated Jul 27, 2026
Information disclosure in Apple macOS WebDAV before Sonoma 14.8.8, Sequoia 15.7.8, and Tahoe 26.6 allows local users to read kernel memory. The webdav_sendmsg path accepts a successful short reply without verifying iolen, and webdav_read_bytes copies the full requested count from an uninitialized kernel buffer. A user must mount an attacker-controlled WebDAV server and a local app must read beyond a stalled file's cached prefix; the response exposes stale kernel data but does not alter it.
Summary
What happened
Information disclosure in Apple macOS WebDAV before Sonoma 14.8.8, Sequoia 15.7.8, and Tahoe 26.6 allows local users to read kernel memory. The webdav_sendmsg path accepts a successful short reply without verifying iolen, and webdav_read_bytes copies the full requested count from an uninitialized kernel buffer. A user must mount an attacker-controlled WebDAV server and a local app must read beyond a stalled file's cached prefix; the response exposes stale kernel data but does not alter it.
The record
- CVE
- CVE-2026-64699
- Published
- Jul 27, 2026
- Updated
- Jul 27, 2026
- Vendor
- Apple
- Product
- macOS
- Classifications
- CWE-457, T1005
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 27, 2026CVE publishedPublication date reported by the CVE source.
- Jul 27, 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 <14.8.8
- Affected versionversion=0 <15.7.8
- Affected versionversion=0 <26.6
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.
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Reported exploitation
- Researcher-demonstrated Apple MIE exploit chainexploit chain
Technologies
Your stack
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Your stack
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