External Control of File Name or Path in cURL - CVE-2026-92390
Published: October 14, 2026
Vulnerability identifier: #VU155675
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-92390
CWE-ID: CWE-73
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to overwrite existing local files.
The vulnerability exists due to failure to preserve anti-clobbering protection in the curl command line tool's HTTP response handling when processing responses with --remote-header-name (-J) enabled. A remote attacker can serve a response containing a Content-Disposition filename preceded by an intermediate 103 Early Hints response, or by an ETag header when --etag-save is enabled, to overwrite existing local files.
The flaw affects only the command line tool, not libcurl.
Affected software
cURL
How to mitigate CVE-2026-92390
Install security update from vendor's website.
cURL - update to 8.23.0