Vulnerability Description
When expanding paths that begin with a tilde (~) followed by a username, the internal parse_tilde function extracts the username to determine the user's home directory. The implementation allocates memory for this username directly on the stack using the strndupa macro. Because the size of this allocation was determined by the length of the user-supplied input without any bounds checks, passing an excessively long username e.g. thousands of characters, forces the thread to exhaust its stack space. Thus if an application passes untrusted, attacker-controlled input to the wordexp function, an attacker can trigger a stack clash.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-6791?
CVE-2026-6791 is a documented vulnerability. When expanding paths that begin with a tilde (~) followed by a username, the internal parse_tilde function extracts the username to determine the user's home directory. The implementation allocates m...
How severe is CVE-2026-6791?
CVSS scoring is not yet available for CVE-2026-6791. Check NVD for updates.
Is there a patch for CVE-2026-6791?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.