Issued at: 2026-08-17
Updated at: 2026-08-18
Advisory content derived from Red Hat RHSA-2026:55439, © Red Hat, Inc., used under CC BY 4.0, with modifications.
Synopsis
Important: curl security update
Description
The curl packages provide the libcurl library and the curl utility for downloading files from servers using various protocols, including HTTP, FTP, and LDAP.
Security Fix(es):
* curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication (CVE-2026-1965)
* curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect (CVE-2026-3783)
* curl: curl: Man-in-the-middle attack via SSH host key bypass (CVE-2026-9547)
* curl: curl: Insecure connection establishment due to TLS configuration mismatch (CVE-2026-8286)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.