CVE-2026-6253
proxy credentials leak over redirect-to proxy
Description
curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy
INFO
Published Date :
May 13, 2026, 8:28 a.m.
Last Modified :
May 13, 2026, 9:05 a.m.
Remotely Exploit :
No
Source :
curl
Solution
- Update curl to the latest version.
- Configure proxy settings carefully.
- Avoid using different proxies for different schemes.
- Test proxy behavior with redirects.
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