CVE-2026-42769

OpenSSL is vulnerable to trust-anchor substitution due to a typo in the certificate chain building code when processing Certificate Management Protocol (CMP) messages. Specifically, in the id-it-rootCaKeyUpdate message (RFC 9810), the code incorrectly adds the newWithOld certificate instead of th...

CVE-2026-42769 Trust-Anchor Substitution via cert/issuer Typo in CMP rootCaKeyUpdate

Issue Summary: An error in the callback used to verify the certificate provided in a Root CA key update Certificate Management Protocol CMP message response rendered the certificate validation ineffectual, which could lead to escalation of credentials from the Registration Authority RA level to t...