Local IPC disclosure via insecure mmap backing-file creation
Published Jul 21, 2026 · Updated Jul 21, 2026
Information disclosure in Data::HashMap::Shared before 0.14 allows local users to read IPC payloads through an mmap backing file. In shm_generic.h, open() creates the path with mode 0666 and omits O_NOFOLLOW and O_EXCL, leaving default-umask files world-readable and accepting pre-planted files or symlinks. Exposure requires a file-backed segment in a shared directory such as /tmp or /dev/shm; local users can read its contents or redirect creation to an attacker-chosen path.
Summary
What happened
Information disclosure in Data::HashMap::Shared before 0.14 allows local users to read IPC payloads through an mmap backing file. In shm_generic.h, open() creates the path with mode 0666 and omits O_NOFOLLOW and O_EXCL, leaving default-umask files world-readable and accepting pre-planted files or symlinks. Exposure requires a file-backed segment in a shared directory such as /tmp or /dev/shm; local users can read its contents or redirect creation to an attacker-chosen path.
The record
- CVE
- CVE-2026-65064
- Published
- Jul 21, 2026
- Updated
- Jul 21, 2026
- Vendor
- Yegor Korablev
- Product
- Data::HashMap::Shared
- Classifications
- CWE-59, CWE-732, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 21, 2026CVE publishedPublication date reported by the CVE source.
- Jul 21, 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?
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- Affected versionversion=0 <0.14
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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