Server crash or code execution via unsafe concatenation
Published Jul 21, 2026 · Updated Jul 21, 2026
Stack buffer overflow in Red Hat Enterprise Linux 10 and Red Hat Hardened Images allows local users to crash or execute SFTP server code. The process_readdir() path passes attacker-controlled directory-entry names to readdir_long_name(), whose repeated unbounded strcat() calls append them into a fixed-size stack buffer. Exploitation requires an SFTP directory listing of an attacker-controlled directory with sufficiently long filenames; the result is a server-process crash or code execution.
Summary
What happened
Stack buffer overflow in Red Hat Enterprise Linux 10 and Red Hat Hardened Images allows local users to crash or execute SFTP server code. The process_readdir() path passes attacker-controlled directory-entry names to readdir_long_name(), whose repeated unbounded strcat() calls append them into a fixed-size stack buffer. Exploitation requires an SFTP directory listing of an attacker-controlled directory with sufficiently long filenames; the result is a server-process crash or code execution.
The record
- CVE
- CVE-2026-15370
- Published
- Jul 21, 2026
- Updated
- Jul 21, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 10
- Classifications
- CWE-121, T1203
- 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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