Heap address disclosure via short SFTP handle
Published Sep 1, 2026 · Updated Sep 2, 2026
Information disclosure in the GVfs SFTP backend before 1.60.2 allows remote attackers to read process heap addresses via a malicious server. The read_string() function accepts a short FXP_HANDLE reply without confirming that its allocated buffer was fully filled, then reuses and sends the uninitialized bytes as the file handle. A user must mount the attacker's SFTP share; the leak reveals heap and libgio load addresses and defeats ASLR without altering data or availability.
Summary
What happened
Information disclosure in the GVfs SFTP backend before 1.60.2 allows remote attackers to read process heap addresses via a malicious server. The read_string() function accepts a short FXP_HANDLE reply without confirming that its allocated buffer was fully filled, then reuses and sends the uninitialized bytes as the file handle. A user must mount the attacker's SFTP share; the leak reveals heap and libgio load addresses and defeats ASLR without altering data or availability.
The record
- CVE
- CVE-2026-84267
- Published
- Sep 1, 2026
- Updated
- Sep 2, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 10
- Classifications
- CWE-908
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 1, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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.
Weakness, pattern, technique
Public exploit references
- GVfs short FXP_HANDLE proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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