Description
A flaw was found in curl. A malicious or compromised HTTP proxy server can trick curl into sending authentication credentials intended for the target destination server directly to the proxy itself. When establishing a connection tunnel, if the proxy replies with an HTTP 401 Unauthorized status code instead of a proxy authentication challenge, curl mishandles the response and transmits the origin server's credentials. This issue leads to information disclosure, allowing an untrusted proxy to intercept sensitive passwords and authentication tokens.
Analysis
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Remediation
No vendor fix or workaround currently provided.
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Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
 Ubuntu USN |
USN-8927-1 | curl vulnerabilities |
| Ubuntu USN |
USN-8932-1 | curl vulnerabilities |
References
History
Thu, 15 Oct 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in curl. A malicious or compromised HTTP proxy server can trick curl into sending authentication credentials intended for the target destination server directly to the proxy itself. When establishing a connection tunnel, if the proxy replies with an HTTP 401 Unauthorized status code instead of a proxy authentication challenge, curl mishandles the response and transmits the origin server's credentials. This issue leads to information disclosure, allowing an untrusted proxy to intercept sensitive passwords and authentication tokens. | |
| Title | curl: curl: leaking host credentials to HTTP proxy | |
| Weaknesses | CWE-201 | |
| References |
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| Metrics |
threat_severity
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cvssV3_1
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Subscriptions
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MITRE
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Vulnrichment
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NVD
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Redhat
OpenCVE Enrichment
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Weaknesses
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CWE-201
Insertion of Sensitive Information Into Sent Data