Unscored severity · published Oct 29, 2026
CVE-2026-105031
Apache Qpid Proton C: The OpenSSL TLS implementation adds a locally trusted certificate authority to the existing trusted system trust anchors.
New
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CVSS
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EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AQ
Apache Qpid Proton C · Apache Software Foundation
through 0.40.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105031
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105031
vendor-advisory
https://lists.apache.org/thread.html/lc10nrjt2dwcjjhrsgoyy5tqkntsnor4
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