Fedora 43 curl Important Token Leak SMB Fix Advisory FEDORA-2026-66db242036
fedora
April 22, 2026
Fix bad reuse of HTTP Negotiate connection (CVE-2026-1965) Fix token leak with redirect and netrc (CVE-2026-3783) Fix wrong proxy connection reuse with credentials (CVE-2026-3784) ...
Summary
curl is a command line tool for transferring data with URL syntax, supporting
FTP, FTPS, HTTP, HTTPS, SCP, SFTP, TFTP, TELNET, DICT, LDAP, LDAPS, FILE, IMAP,
SMTP, POP3 and RTSP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP
uploading, HTTP form based upload, proxies, cookies, user+password
authentication (Basic, Digest, NTLM, Negotiate, kerberos...), file transfer
resume, proxy tunneling and a busload of other useful tricks.
Update Information:
Fix bad reuse of HTTP Negotiate connection (CVE-2026-1965) Fix token leak with redirect and netrc (CVE-2026-3783) Fix wrong proxy connection reuse with credentials (CVE-2026-3784) Fix use after free in SMB connection reuse (CVE-2026-3805)
Topics Covered
Change Log
* Mon Apr 13 2026 Jan Macku
References
[ 1 ] Bug #2446465 - CVE-2026-3805 curl: curl: Arbitrary code execution or Denial of Service via use-after-free in SMB request handling [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2446465
[ 2 ] Bug #2446480 - CVE-2026-3783 curl: curl: Information disclosure via OAuth2 bearer token leakage during HTTP(S) redirect [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2446480
[ 3 ] Bug #2446495 - CVE-2026-3784 curl: curl: Unauthorized access due to improper HTTP proxy connection reuse [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2446495
[ 4 ] Bug #2446511 - CVE-2026-1965 curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication [fedora-43]
https://bugzilla.redhat.com/show_bug.cgi?id=2446511
Update Instructions
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-66db242036' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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Name: curl
Product: Fedora 43
Version: 8.15.0
Release: 6.fc43
URL: https://curl.se/
Summary: A utility for getting files from remote servers (FTP, HTTP, and others)
Topics Covered
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