RHSA-2026:55439: Important: curl security update

Published Aug 17, 2026
·
Updated

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.

Affected Software

40 affected componentsFixes available
redhat/curl<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-debugsource<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-debugsource<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-minimal<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-minimal-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-minimal-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-devel<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-devel<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-minimal<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-minimal<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-minimal-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-minimal-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-minimal<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-debugsource<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-minimal<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl-minimal-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-devel<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-minimal<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/libcurl-minimal-debuginfo<7.76.1-40.el9_8.5
7.76.1-40.el9_8.5
redhat/curl<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/curl-debuginfo<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/curl-debugsource<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/curl-minimal<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/curl-minimal-debuginfo<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/libcurl<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/libcurl-debuginfo<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/libcurl-devel<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/libcurl-minimal<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa
redhat/libcurl-minimal-debuginfo<7.76.1-40.el9_8.5.aa
7.76.1-40.el9_8.5.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/curl to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  2. Upgrade

    Upgrade redhat/curl-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  3. Upgrade

    Upgrade redhat/curl-debugsource to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  4. Upgrade

    Upgrade redhat/curl-minimal to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  5. Upgrade

    Upgrade redhat/curl-minimal-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  6. Upgrade

    Upgrade redhat/libcurl to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  7. Upgrade

    Upgrade redhat/libcurl-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  8. Upgrade

    Upgrade redhat/libcurl-devel to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  9. Upgrade

    Upgrade redhat/libcurl-minimal to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  10. Upgrade

    Upgrade redhat/libcurl-minimal-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5
  11. Upgrade

    Upgrade redhat/curl to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  12. Upgrade

    Upgrade redhat/curl-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  13. Upgrade

    Upgrade redhat/curl-debugsource to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  14. Upgrade

    Upgrade redhat/curl-minimal to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  15. Upgrade

    Upgrade redhat/curl-minimal-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  16. Upgrade

    Upgrade redhat/libcurl to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  17. Upgrade

    Upgrade redhat/libcurl-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  18. Upgrade

    Upgrade redhat/libcurl-devel to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  19. Upgrade

    Upgrade redhat/libcurl-minimal to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  20. Upgrade

    Upgrade redhat/libcurl-minimal-debuginfo to a version that resolves this vulnerability.

    Fixed in 7.76.1-40.el9_8.5.aa
  21. Upgrade

    Upgrade curl to a version that resolves this vulnerability.

    Patch CVE-2026-3783
  22. Upgrade

    Upgrade curl to a version that resolves this vulnerability.

    Patch CVE-2026-8286
  23. Upgrade

    Upgrade curl to a version that resolves this vulnerability.

    Patch CVE-2026-9547
  24. Upgrade

    Upgrade curl to a version that resolves this vulnerability.

    Patch CVE-2026-1965

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software

Frequently Asked Questions

1

Which curl-related packages are covered by this update?

The update covers curl, curl-minimal, libcurl, libcurl-devel, and their listed debuginfo and debugsource packages.

2

What attack scenarios are addressed by the security fixes?

The fixes address an authentication bypass involving reused connections with Negotiate authentication, OAuth2 bearer-token disclosure during HTTP(S) redirects, SSH host-key bypass enabling man-in-the-middle attacks, and insecure connection establishment caused by a TLS configuration mismatch.

Company

Resources

Contact

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