Vulnerability Description
When an FTP wildcard `LIST` operation fails, libcurl omits the restoration path meant for successful listings, leaving the write callback set to the internal listing parser and the write callback data pointing directly to the easy handle. Subsequent reuse of this handle triggers an immediate crash, and cloning it via `curl_easy_duphandle()` copies this corrupted state into the duplicate. If the original handle is subsequently freed, executing a transfer on the cloned handle causes a heap use-after-free read against the dangling handle reference; alternatively, reusing the original or cloned handle while changing only `CURLOPT_WRITEDATA` (and omitting `CURLOPT_WRITEFUNCTION`) results in type confusion, forcing the internal parser to interpret incoming server response bytes into memory at the application-supplied write data pointer.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://curl.se/docs/CVE-2026-92388.html
- https://curl.se/docs/CVE-2026-92388.json
- https://hackerone.com/reports/4022070
- https://hackerone.com/reports/4022070
FAQ
What is CVE-2026-92388?
CVE-2026-92388 is a vulnerability with a CVSS score of 9.1 (CRITICAL). When an FTP wildcard `LIST` operation fails, libcurl omits the restoration path meant for successful listings, leaving the write callback set to the internal listing parser and the write callback data...
How severe is CVE-2026-92388?
CVE-2026-92388 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-92388?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.