Authentication Bypass by Primary Weakness in cURL - CVE-2026-1965

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Main Vulnerability Database Vulnerabilities #VU123888

Authentication Bypass by Primary Weakness in cURL - CVE-2026-1965

Published: March 11, 2026


Vulnerability identifier: #VU123888
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-1965
CWE-ID: CWE-305
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to improper reuse of HTTP Negotiate connection. A remote attacker can bypass authentication and gain access to the target system.


Affected software

cURL
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 15
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
Anolis OS
Fedora
LANTIME Operating System Firmware (LTOS)
curl (Ubuntu package)
libcurl-devel
curl
curl-debuginfo
curl-debugsource
libcurl
curl-help
libcurl4-debuginfo-32bit
libcurl4-32bit
libcurl4-debuginfo
libcurl4
curl-minimal
libcurl-minimal
curl-doc
libcurl-mini4
curl-fish-completion
curl-mini-debugsource
libcurl-mini4-debuginfo
curl-zsh-completion
libcurl-devel-doc
libcurl-devel-32bit
libcurl-devel-64bit
libcurl4-64bit
libcurl4-64bit-debuginfo
libcurl4-32bit-debuginfo

How to mitigate CVE-2026-1965

Install updates from vendor's website.

cURL - update to 8.19.0
LANTIME Operating System Firmware (LTOS) - update to 7.10.009
curl (Ubuntu package) - addressed in versions 7.58.0-2ubuntu3.24+esm8, 7.68.0-1ubuntu2.25+esm3, 7.81.0-1ubuntu1.23, 8.5.0-2ubuntu10.8, 8.14.1-2ubuntu1.2
libcurl-devel - update to 7.71.1-47
curl - update to 7.71.1-47
curl-debuginfo - update to 7.71.1-47
curl-debugsource - update to 7.71.1-47
libcurl - update to 7.71.1-47
curl-help - update to 7.71.1-47
libcurl4-debuginfo-32bit - update to 8.0.1-11.120.1
libcurl4-32bit - addressed in versions 8.0.1-11.120.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
libcurl4-debuginfo - addressed in versions 8.0.1-11.120.1, 8.14.1-150200.4.103.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
curl - addressed in versions 8.0.1-11.120.1, 8.14.1-150200.4.103.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
libcurl4 - addressed in versions 8.0.1-11.120.1, 8.14.1-150200.4.103.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
libcurl-devel - addressed in versions 8.0.1-11.120.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
curl-debuginfo - addressed in versions 8.0.1-11.120.1, 8.14.1-150200.4.103.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
curl-debugsource - addressed in versions 8.0.1-11.120.1, 8.14.1-150200.4.103.1, 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1
curl - update to 8.4.0-15
curl-minimal - update to 8.4.0-15
libcurl - update to 8.4.0-15
libcurl-devel - update to 8.4.0-15
libcurl-minimal - update to 8.4.0-15
curl-doc - update to 8.4.0-15
curl - addressed in versions 8.11.1-8.fc42, 8.15.0-6.fc43, 8.18.0-6.fc44
libcurl-mini4 - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
curl-fish-completion - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
curl-mini-debugsource - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl-mini4-debuginfo - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
curl-zsh-completion - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl-devel-doc - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl-devel-32bit - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl-devel-64bit - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl4-64bit - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl4-64bit-debuginfo - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1
libcurl4-32bit-debuginfo - addressed in versions 8.14.1-150400.5.80.1, 8.14.1-150400.5.83.1, 8.14.1-150600.4.40.1, 8.14.1-150600.4.43.1, 8.14.1-150700.7.14.1

External References

Related Security Bulletins