libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade curl | Jul 6, 2026 | Jul 3, 2026 |
| Redhat_linux | — | Upgrade libcurl-develUpgrade curlUpgrade curl-debugsourceUpgrade libcurl-debuginfoUpgrade curl-debuginfoUpgrade libcurl-minimal-debuginfoUpgrade libcurl-minimalUpgrade libcurl | Sep 2, 2026 | Jul 3, 2026 |
| Ubuntu | — | Upgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl4-gnutls-dev (Ubuntu Pro)Upgrade curl (Ubuntu Pro)Upgrade libcurl4-gnutls-devUpgrade libcurl4Upgrade libcurl3-nss (Ubuntu Pro)Upgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl3-gnutlsUpgrade libcurl3-nssUpgrade curlUpgrade libcurl3 (Ubuntu Pro)Upgrade libcurl4 (Ubuntu Pro)Upgrade libcurl4t64Upgrade libcurl4-nss-devUpgrade libcurl4-openssl-devUpgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl3t64-gnutls | Jul 1, 2026 | Jun 30, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 13, 2026 | Jul 3, 2026 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub