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              "value": "Issue Summary: An error in the callback used to verify the certificate\u003cbr\u003eprovided in a Root CA key update Certificate Management Protocol (CMP)\u003cbr\u003emessage response rendered the certificate validation ineffectual, which\u003cbr\u003ecould lead to escalation of credentials from the Registration Authority (RA)\u003cbr\u003elevel to the root Certification Authority (root CA) level.\u003cbr\u003e\u003cbr\u003eImpact Summary: The Registration Autority could replace the root CA\u003cbr\u003ecertificate for the CMP clients with an arbitrary root CA certificate.\u003cbr\u003e\u003cbr\u003eOne of the parts of the Certificate Management Protocol (CMP), specified in\u003cbr\u003eRFC 9810, is Root Certification Authority (root CA) key Rollover,\u003cbr\u003ewhich is sent by the server in a message with type \u0027id-it-rootCaKeyUpdate\u0027.\u003cbr\u003eAs part of these messages, \u0027newWithOld\u0027 certificate, the new root CA\u003cbr\u003ecertificate signed with the old root CA key, is provided, and verifying its\u003cbr\u003esignature is crucial for transferring the trust from the old CA key to the\u003cbr\u003enew one.\u003cbr\u003e\u003cbr\u003eThe \u0027id-it-rootCaKeyUpdate\u0027 messages are expected to be processed with\u003cbr\u003eOSSL_CMP_get1_rootCaKeyUpdate(), that is expected to verify the \u0027newWithOld\u0027\u003cbr\u003ecertificate.  A typo in the certificate chain building code led to adding\u003cbr\u003ean incorrect certificate (\u0027newWithOld\u0027 instead of \u0027oldRoot\u0027) to the\u003cbr\u003ecertificate chain, rendering the certificate verification process ineffectual\u003cbr\u003e(only the issuer name and the algorithm OIDs were verified by other parts\u003cbr\u003eof the verification code).\u003cbr\u003e\u003cbr\u003eAn attacker who already has credentials that satisfy the CMP message\u003cbr\u003eprotection checks can generate a new key pair and use a crafted self-signed\u003cbr\u003ecertificate in its \u0027id-it-rootCaKeyUpdate\u0027 CMP messages which affected CMP\u003cbr\u003eclients would accept as a new trust anchor.\u003cbr\u003e\u003cbr\u003eSignificant preconditions for the attack (having valid RA-level credentials)\u003cbr\u003eare the reason the issue was assigned Low severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules are not affected by this issue, as the affected code is\u003cbr\u003eoutside the OpenSSL FIPS module boundary."
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          "value": "Issue Summary: An error in the callback used to verify the certificate\nprovided in a Root CA key update Certificate Management Protocol (CMP)\nmessage response rendered the certificate validation ineffectual, which\ncould lead to escalation of credentials from the Registration Authority (RA)\nlevel to the root Certification Authority (root CA) level.\n\nImpact Summary: The Registration Autority could replace the root CA\ncertificate for the CMP clients with an arbitrary root CA certificate.\n\nOne of the parts of the Certificate Management Protocol (CMP), specified in\nRFC 9810, is Root Certification Authority (root CA) key Rollover,\nwhich is sent by the server in a message with type \u0027id-it-rootCaKeyUpdate\u0027.\nAs part of these messages, \u0027newWithOld\u0027 certificate, the new root CA\ncertificate signed with the old root CA key, is provided, and verifying its\nsignature is crucial for transferring the trust from the old CA key to the\nnew one.\n\nThe \u0027id-it-rootCaKeyUpdate\u0027 messages are expected to be processed with\nOSSL_CMP_get1_rootCaKeyUpdate(), that is expected to verify the \u0027newWithOld\u0027\ncertificate.  A typo in the certificate chain building code led to adding\nan incorrect certificate (\u0027newWithOld\u0027 instead of \u0027oldRoot\u0027) to the\ncertificate chain, rendering the certificate verification process ineffectual\n(only the issuer name and the algorithm OIDs were verified by other parts\nof the verification code).\n\nAn attacker who already has credentials that satisfy the CMP message\nprotection checks can generate a new key pair and use a crafted self-signed\ncertificate in its \u0027id-it-rootCaKeyUpdate\u0027 CMP messages which affected CMP\nclients would accept as a new trust anchor.\n\nSignificant preconditions for the attack (having valid RA-level credentials)\nare the reason the issue was assigned Low severity.\n\nThe FIPS modules are not affected by this issue, as the affected code is\noutside the OpenSSL FIPS module boundary."
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          "url": "https://openssl-library.org/news/secadv/20260609.txt"
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          "name": "3.5.7 git commit",
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          "name": "3.4.6 git commit",
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          "url": "https://github.com/openssl/openssl/commit/777b363b16fcf2153bb3ded39dc3838713667c44"
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "Trust-Anchor Substitution via cert/issuer Typo in CMP rootCaKeyUpdate",
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    "assignerShortName": "openssl",
    "cveId": "CVE-2026-42769",
    "datePublished": "2026-06-09T16:03:28.999Z",
    "dateReserved": "2026-04-29T09:22:27.969Z",
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              "value": "Issue summary: When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42)\u003cbr\u003epeer key, the peer key is not properly checked for the subgroup membership.\u003cbr\u003e\u003cbr\u003eImpact summary: A malicious peer which presents an X9.42 key carrying the\u003cbr\u003evictim\u0027s p and g parameters, a forged q = r (a small prime factor of the\u003cbr\u003ecofactor (p\u22121)/q_local), and a public value Y of order r can recover the\u003cbr\u003evictim\u0027s private key after a small number of key exchange attempts.\u003cbr\u003e\u003cbr\u003eWhen EVP_PKEY_derive_set_peer() is called with a DHX (X9.42) peer key, the\u003cbr\u003esubgroup membership check Y^q \u2261 1 (mod p) is performed using the peer\u0027s\u003cbr\u003eown q parameter, not the local key\u0027s q. The peer\u0027s domain parameters are\u003cbr\u003ethen matched against the domain parameters of the private key, but the value\u003cbr\u003eof q is not compared.\u003cbr\u003e\u003cbr\u003eA malicious peer who presents an X9.42 key carrying the victim\u0027s p, g,\u003cbr\u003ea forged q = r (a small prime factor of the cofactor), and a public\u003cbr\u003evalue Y of order r passes all checks. The shared secret then takes only\u003cbr\u003er distinct values, leaking priv mod r. Repeating for each small-prime\u003cbr\u003efactor of the cofactor and combining via CRT recovers the full private\u003cbr\u003ekey (Lim\u2013Lee / small-subgroup-confinement attack).\u003cbr\u003e\u003cbr\u003eThe realistic attack surface is narrow: principally CMP deployments with\u003cbr\u003elong-lived RA/CA DHX keys and bespoke enterprise or government applications\u003cbr\u003eusing X9.42 DHX static keys with interactive protocols and therefore this\u003cbr\u003eissue was assigned Low severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 4.0, 3.6, 3.5, 3.4, 3.1.2 and 3.0 are affected by this\u003cbr\u003eissue."
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