CVE-2026-1965

bad reuse of HTTP Negotiate connection

CVE-2026-1965 is fixed in 11 products on 1 platform, first by curl 7.68.0-1ubuntu2.25+esm3, released March 11, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
8.1
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0030
22nd percentile

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.

Where it's fixed

ProductFixed inFixReleased
Linux
curl · Debian 13.5 (trixie) 8.14.1-2+deb13u4 DEBIAN-CVE-2026-1965 Mar 11, 2026
curl · Debian 14 8.19.0~rc3-1 DEBIAN-CVE-2026-1965 Mar 11, 2026
curl · RHEL 10 8.12.1-1.el10_0.10 RHSA-2026:72506 Jul 3, 2026
curl · RHEL 9 0:7.76.1-40.el9_8.5 RHSA-2026:55439 Aug 19, 2026
curl · Ubuntu 20.04 LTS (focal) 7.68.0-1ubuntu2.25+esm3 curl 7.68.0-1ubuntu2.25+esm3 Mar 11, 2026
curl · Ubuntu 22.04.1 LTS (jammy) 7.81.0-1ubuntu1.23 curl 7.81.0-1ubuntu1.23 Mar 11, 2026
curl · Ubuntu 24.04.5 LTS (noble) 8.5.0-2ubuntu10.8 curl 8.5.0-2ubuntu10.8 Mar 11, 2026
curl · Ubuntu 25.10 (questing) 8.14.1-2ubuntu1.2 curl 8.14.1-2ubuntu1.2 Mar 11, 2026
curl · Ubuntu 26.04.1 LTS (resolute) 8.18.0-1ubuntu2 curl 8.18.0-1ubuntu2 Mar 11, 2026
curl · almalinux 9 7.76.1-40.el9_8.5 ALSA-2026:55439 Aug 17, 2026
curl · ol 10 0:8.12.1-4.el10_2.4 ELSA-2026-55450 Aug 17, 2026
curl · ol 9 0:7.76.1-40.el9_8.5 ELSA-2026-55439 Aug 17, 2026
curl · opensuse-leap 15.6 8.14.1-150600.4.40.1 SUSE-SU-2026:0885-1 Mar 12, 2026
curl · opensuse-leap 16.0 8.14.1-160000.5.1 OPENSUSE-SU-2026:20404-1 Mar 20, 2026
curl · rocky 9 0:7.76.1-40.el9_8.5 RLSA-2026:55439 Aug 17, 2026
curl · sles 15.6 8.14.1-150600.4.40.1 SUSE-SU-2026:0885-1 Mar 12, 2026
curl · sles 15.7 8.14.1-150700.7.14.1 SUSE-SU-2026:0903-1 Mar 17, 2026
curl · sles 16.0 8.14.1-160000.5.1 SUSE-SU-2026:20918-1 Mar 20, 2026
curl-mini · sles 16.0 8.14.1-160000.5.1 SUSE-SU-2026:20918-1 Mar 20, 2026
curl-minimal · RHEL 9 0:7.76.1-40.el9_8.5 RHSA-2026:55439 Aug 19, 2026
curl-minimal · almalinux 9 7.76.1-40.el9_8.5 ALSA-2026:55439 Aug 17, 2026
curl-minimal · ol 9 0:7.76.1-40.el9_8.5 ELSA-2026-55439 Aug 17, 2026
libcurl · RHEL 9 0:7.76.1-40.el9_8.5 RHSA-2026:55439 Aug 19, 2026
libcurl · almalinux 9 7.76.1-40.el9_8.5 ALSA-2026:55439 Aug 17, 2026
libcurl · ol 10 0:8.12.1-4.el10_2.4 ELSA-2026-55450 Aug 17, 2026
libcurl · ol 9 0:7.76.1-40.el9_8.5 ELSA-2026-55439 Aug 17, 2026
libcurl-devel · RHEL 9 0:7.76.1-40.el9_8.5 RHSA-2026:55439 Aug 19, 2026
libcurl-devel · almalinux 9 7.76.1-40.el9_8.5 ALSA-2026:55439 Aug 17, 2026
libcurl-devel · ol 10 0:8.12.1-4.el10_2.4 ELSA-2026-55450 Aug 17, 2026
libcurl-devel · ol 9 0:7.76.1-40.el9_8.5 ELSA-2026-55439 Aug 17, 2026
libcurl-minimal · RHEL 9 0:7.76.1-40.el9_8.5 RHSA-2026:55439 Aug 19, 2026
libcurl-minimal · almalinux 9 7.76.1-40.el9_8.5 ALSA-2026:55439 Aug 17, 2026
libcurl-minimal · ol 10 0:8.12.1-4.el10_2.4 ELSA-2026-55450 Aug 17, 2026
libcurl-minimal · ol 9 0:7.76.1-40.el9_8.5 ELSA-2026-55439 Aug 17, 2026
libcurl3-gnutls · Ubuntu 20.04 LTS (focal) 7.68.0-1ubuntu2.25+esm3 libcurl3-gnutls 7.68.0-1ubuntu2.25+esm3 Mar 11, 2026
libcurl3-gnutls · Ubuntu 22.04.1 LTS (jammy) 7.81.0-1ubuntu1.23 libcurl3-gnutls 7.81.0-1ubuntu1.23 Mar 11, 2026
libcurl3-nss · Ubuntu 20.04 LTS (focal) 7.68.0-1ubuntu2.25+esm3 libcurl3-nss 7.68.0-1ubuntu2.25+esm3 Mar 11, 2026
libcurl3-nss · Ubuntu 22.04.1 LTS (jammy) 7.81.0-1ubuntu1.23 libcurl3-nss 7.81.0-1ubuntu1.23 Mar 11, 2026
libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble) 8.5.0-2ubuntu10.8 libcurl3t64-gnutls 8.5.0-2ubuntu10.8 Mar 11, 2026
libcurl3t64-gnutls · Ubuntu 25.10 (questing) 8.14.1-2ubuntu1.2 libcurl3t64-gnutls 8.14.1-2ubuntu1.2 Mar 11, 2026
libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute) 8.18.0-1ubuntu2 libcurl3t64-gnutls 8.18.0-1ubuntu2 Mar 11, 2026
libcurl4 · Ubuntu 20.04 LTS (focal) 7.68.0-1ubuntu2.25+esm3 libcurl4 7.68.0-1ubuntu2.25+esm3 Mar 11, 2026
libcurl4 · Ubuntu 22.04.1 LTS (jammy) 7.81.0-1ubuntu1.23 libcurl4 7.81.0-1ubuntu1.23 Mar 11, 2026
libcurl4t64 · Ubuntu 24.04.5 LTS (noble) 8.5.0-2ubuntu10.8 libcurl4t64 8.5.0-2ubuntu10.8 Mar 11, 2026
libcurl4t64 · Ubuntu 25.10 (questing) 8.14.1-2ubuntu1.2 libcurl4t64 8.14.1-2ubuntu1.2 Mar 11, 2026
libcurl4t64 · Ubuntu 26.04.1 LTS (resolute) 8.18.0-1ubuntu2 libcurl4t64 8.18.0-1ubuntu2 Mar 11, 2026

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