CVE-2026-92388

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 reconfiguring 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.

Why is this CVE low priority?

Upstream defined this as low severity

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Patch details

References

• MITRE
• NVD
• Launchpad
• Debian

Related Ubuntu Security Notices (USN)

• USN-8927-1
• curl vulnerabilities
• 14 October 2026
• USN-8932-1
• curl vulnerabilities
• 14 October 2026
• USN-8927-2
• curl vulnerabilities
• 19 October 2026

Other references

• https://www.cve.org/CVERecord?id=CVE-2026-92388
• https://curl.se/docs/CVE-2026-92388.html