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OpenSSL contains a certificate validation flaw in Certificate Management Protocol (CMP) Root CA key rollover processing. When handling an 'id-it-rootCaKeyUpdate' response via OSSL_CMP_get1_rootCaKeyUpdate(), the implementation is expected to validate the 'newWithOld' certificate, which carries the new root CA certificate signed by the old root CA key to transfer trust from the old anchor to the new one. Due to a typo in the certificate chain building logic, the code adds the wrong certificate to the chain, causing signature verification of the 'newWithOld' certificate to become ineffectual. As a result, verification is reduced to limited checks such as issuer-name and algorithm-OID consistency rather than effective cryptographic validation of the trust transition. An attacker who already possesses CMP message-protection credentials sufficient to satisfy Registration Authority-level checks can exploit this weakness by sending a crafted root CA key update message containing an arbitrary self-signed certificate, causing affected CMP clients to accept it as a new trust anchor. The vulnerable code is outside the OpenSSL FIPS module boundary, so FIPS modules are not affected.
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No public exploit code observed for this vulnerability.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability addressed in Alpine Linux 3.22.5 and 3.23.5 as part of the June 9, 2026 OpenSSL advisory.
An OpenSSL vulnerability addressed in Alpine Linux 3.24.1 as part of the June 9, 2026 advisory.
A low-severity OpenSSL CMP root CA key update validation flaw caused by a certificate chain building typo, enabling trust-anchor substitution under significant preconditions.
A security vulnerability in OpenSSL fixed by updating OpenSSL to version 3.5.7; no further details are provided in the content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.