CVE-2026-6253

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

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Produits concernés

• curl
• Haxx curl

Scores CVSS

Faiblesses (CWE)

• CWE-522

Références

• https://curl.se/docs/CVE-2026-6253.html PatchVendor Advisory
• https://curl.se/docs/CVE-2026-6253.json Vendor Advisory
• https://hackerone.com/reports/3669637 ExploitIssue TrackingThird Party Advisory
• http://www.openwall.com/lists/oss-security/2026/04/29/11 Mailing ListPatchThird Party Advisory
• https://hackerone.com/reports/3669637 ExploitIssue TrackingThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories