When invoked with `--remote-header-name` (`-J`), curl fails to preserve its documented anti-clobbering protection if an intermediate 103 Early Hints response precedes the final HTTP response, or if an `ETag` header is processed before `Content-Disposition` under `--etag-save`. This flaw allows an HTTP(S) server to overwrite an existing local file specified in the `Content-Disposition` header despite the presence of the `-J` non-overwrite constraint.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Curl
  • Curl

No data.

No data.

References
Link Providers
https://curl.se/docs/CVE-2026-92390.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-92390.json cve-icon cve-icon
https://hackerone.com/reports/4023192 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-92390 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-92390 cve-icon
History

Tue, 20 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in curl. When the command-line tool is executed with the remote header name option to prevent overwriting existing files, a malicious server can bypass this protection by returning an intermediate HTTP 103 (Early Hints) response or through specific header ordering. This flaw allows an attacker controlling a remote server to overwrite existing local files on the client system. When invoked with `--remote-header-name` (`-J`), curl fails to preserve its documented anti-clobbering protection if an intermediate 103 Early Hints response precedes the final HTTP response, or if an `ETag` header is processed before `Content-Disposition` under `--etag-save`. This flaw allows an HTTP(S) server to overwrite an existing local file specified in the `Content-Disposition` header despite the presence of the `-J` non-overwrite constraint.
Title curl: curl: -J no-clobber guarantee bypassed with 103 early hints -J no-clobber guarantee bypassed with 103 early hints
References

Sun, 18 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in curl. When the command-line tool is executed with the remote header name option to prevent overwriting existing files, a malicious server can bypass this protection by returning an intermediate HTTP 103 (Early Hints) response or through specific header ordering. This flaw allows an attacker controlling a remote server to overwrite existing local files on the client system.
Title curl: curl: -J no-clobber guarantee bypassed with 103 early hints
Weaknesses CWE-73
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'}

threat_severity

Low
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-10-20T20:23:08.900Z

Updated: 2026-10-20T20:23:08.900Z

Reserved: 2026-09-16T08:12:50.387Z

Link: CVE-2026-92390

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T21:17:21.703

Modified: 2026-10-22T17:21:57.293

Link: CVE-2026-92390

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-14T12:00:00Z

Links: CVE-2026-92390 - Bugzilla