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
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Jun 18, 2026 | May 13, 2026 |
| Debian | — | Upgrade curl | Jul 23, 2026 | Jul 23, 2026 |
| Ibm Aix | — | Apply the fix or workaround for curl_advisory12 | Sep 21, 2026 | Sep 21, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Apr 29, 2026 |
| Ubuntu | — | Upgrade libcurl3-gnutlsUpgrade libcurl3t64-gnutlsUpgrade libcurl4Upgrade curlUpgrade libcurl4t64Upgrade libcurl3-nss | May 4, 2026 | Apr 29, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 13, 2026 |
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