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.
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Project Subscriptions
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Advisories
| Source | ID | Title |
|---|---|---|
 Ubuntu USN |
USN-8927-1 | curl vulnerabilities |
| Ubuntu USN |
USN-8932-1 | curl vulnerabilities |
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
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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Projects
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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