Improper Certificate Validation in cURL - CVE-2026-80230

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Main Vulnerability Database Vulnerabilities #VU146681

Improper Certificate Validation in cURL - CVE-2026-80230

Published: September 2, 2026


Vulnerability identifier: #VU146681
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80230
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass public key pinning.

The vulnerability exists due to improper certificate validation in libcurl and the curl command line tool when establishing TLS connections with CURLOPT_PINNEDPUBLICKEY configured and peer and host verification disabled. A remote attacker can present a connection without a server certificate to bypass public key pinning.

This issue is present only when curl is built with OpenSSL or a fork such as BoringSSL, AWS-LC, LibreSSL, or QuicTLS, and the insecure configuration also permits certificate-less connections.


Affected software

cURL
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Basesystem Module
openSUSE Leap
Ubuntu
openEuler
Anolis OS
Fedora
curl
curl-help
libcurl-devel
libcurl
curl-debugsource
curl-debuginfo
libcurl4-32bit
libcurl4-debuginfo-32bit
libcurl4-debuginfo
libcurl4
curl-doc
libcurl-minimal
curl-minimal
libcurl-mini4
libcurl-mini4-debuginfo
curl-mini-debugsource
curl-fish-completion
curl-zsh-completion
libcurl-devel-doc
libcurl4-64bit-debuginfo
libcurl-devel-64bit
libcurl4-64bit
libcurl-devel-32bit
libcurl4-32bit-debuginfo
curl (Ubuntu package)

How to mitigate CVE-2026-80230

Install security update from vendor's website.

cURL - update to 8.22.0
curl - addressed in versions 8.18.0-14.fc44, 8.15.0-12.fc43, 8.21.0-8.fc45
curl-help - addressed in versions 7.71.1-54, 7.79.1-56, 8.4.0-37
libcurl-devel - addressed in versions 7.71.1-54, 7.79.1-56, 8.4.0-37
libcurl - addressed in versions 7.71.1-54, 7.79.1-56, 8.4.0-37
curl-debugsource - addressed in versions 7.71.1-54, 7.79.1-56, 8.4.0-37
curl-debuginfo - addressed in versions 7.71.1-54, 7.79.1-56, 8.4.0-37
curl - addressed in versions 7.71.1-54, 7.79.1-56, 8.4.0-37
curl-debuginfo - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
curl-debugsource - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
libcurl4-32bit - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
curl - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
libcurl4-debuginfo-32bit - update to 8.0.1-11.129.1
libcurl4-debuginfo - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
libcurl4 - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
libcurl-devel - addressed in versions 8.0.1-11.129.1, 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
curl-doc - update to 8.4.0-31
libcurl-minimal - update to 8.4.0-31
libcurl-devel - update to 8.4.0-31
libcurl - update to 8.4.0-31
curl-minimal - update to 8.4.0-31
curl - update to 8.4.0-31
libcurl-mini4 - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-mini4-debuginfo - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl-mini-debugsource - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl-fish-completion - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
curl-zsh-completion - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-devel-doc - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl4-64bit-debuginfo - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-devel-64bit - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl4-64bit - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl-devel-32bit - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1
libcurl4-32bit-debuginfo - addressed in versions 8.14.1-150400.5.91.1, 8.14.1-150600.4.51.1, 8.14.1-150700.7.26.1
curl (Ubuntu package) - addressed in versions 7.47.0-1ubuntu2.19+esm20, 7.58.0-2ubuntu3.24+esm14, 7.68.0-1ubuntu2.25+esm9, 7.81.0-1ubuntu1.29, 8.5.0-2ubuntu10.15, 8.18.0-1ubuntu2.7

External References

Related Security Bulletins