CVE-2026-105031

Critical

Description

When using the OpenSSL TLS implementation, both the pn_ssl_domain_set_trusted_ca_db() & pn_tls_config_set_trusted_certs() APIs added to rather than replaced the default system trust anchors. Leading to potentially trusting unexpected peer certificates. This can be worked around by setting the SSL_CERT_FILE environment variable for the application to /dev/null. This issue does not affect the Win32 SChannel TLS implementation. This issue affects Apache Qpid Proton C: through 0.40.0. Users are recommended to upgrade to version 0.41.1, which fixes the issue.

SeverityCritical

CVSS9.1

Exploit probability—

ProductApache Qpid Proton C

PublishedOct 29, 2026

First seenNov 4, 2026

Weakness typeCWE-295CWE-295

How to fix

Vendor advisories

lists.apache.org/thread.html/lc10nrjt2dwcjjhrsgoyy5tqkntsnor4

Affected products

Product	Affected versions	Fixed in
Apache Software Foundation Apache Qpid Proton C	v ≤ 0.40.0	—

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