CURL-CVE-2026-6253

vendorUSosv

proxy credentials leak over redirect-to proxy

view advisory published 2026-04-29Licence: per source

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

01

describes (1)

Related CVEs.

IDseverity exploitable
CVE-2026-6253US——
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…
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