Authentication material disclosure via uncleared freed heap
Published Jun 18, 2026 · Updated Jun 18, 2026
Information disclosure in mcdope pam_usb 0.9.1 and earlier allows local users to recover authentication material from freed heap memory. The xfree() helper in src/mem.c calls free() without first zeroing heap buffers, leaving one-time pad bytes and other sensitive data available until overwritten. Exploitation requires low-privileged local access plus a use-after-free condition or heap-inspection primitive, and the bounded impact is recovery of pad values or other authentication material.
Summary
What happened
Information disclosure in mcdope pam_usb 0.9.1 and earlier allows local users to recover authentication material from freed heap memory. The xfree() helper in src/mem.c calls free() without first zeroing heap buffers, leaving one-time pad bytes and other sensitive data available until overwritten. Exploitation requires low-privileged local access plus a use-after-free condition or heap-inspection primitive, and the bounded impact is recovery of pad values or other authentication material.
The record
- CVE
- CVE-2026-48984
- Published
- Jun 18, 2026
- Updated
- Jun 18, 2026
- Vendor
- mcdope
- Product
- pam_usb
- Classifications
- CWE-14, CWE-226, T1003
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 18, 2026CVE publishedPublication date reported by the CVE source.
- Jun 18, 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=< 0.9.2
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
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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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