CWE-325

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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, and 3.0 are affected by this\u003cbr\u003eissue."
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      "source": {
        "discovery": "UNKNOWN"
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      "title": "FFC-DH Peer Validation Uses Attacker-Supplied q",
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              "value": "Issue summary: When an application drives an AES-OCB context through the\u003cbr\u003epublic EVP_Cipher() one-shot interface, the application-supplied\u003cbr\u003einitialisation vector (IV) is silently discarded.\u003cbr\u003e\u003cbr\u003eImpact summary: Every message encrypted under the same key uses the\u003cbr\u003esame effective nonce regardless of the IV supplied by the caller,\u003cbr\u003eresulting in (key, nonce) reuse and loss of confidentiality.  If the\u003cbr\u003esame code path is used to compute the authentication tag, the tag\u003cbr\u003edepends only on the (key, IV) pair and not on the plaintext or\u003cbr\u003eciphertext, allowing universal forgery of arbitrary ciphertext from a\u003cbr\u003esingle captured message.\u003cbr\u003e\u003cbr\u003eOpenSSL provides two ways to drive a cipher: the documented streaming\u003cbr\u003einterface (EVP_CipherUpdate / EVP_CipherFinal_ex) and a lower-level\u003cbr\u003eone-shot, EVP_Cipher(), whose documentation explicitly recommends\u003cbr\u003eagainst use by applications in favour of EVP_CipherUpdate() and\u003cbr\u003eEVP_CipherFinal_ex().  The OCB provider\u0027s streaming handler flushes\u003cbr\u003ethe application-supplied IV into the OCB context before processing\u003cbr\u003edata; the one-shot handler did not.  Every call to EVP_Cipher() on an\u003cbr\u003eAES-OCB context therefore ran with the all-zero key-derived offset\u003cbr\u003estate left by cipher initialisation, regardless of the caller\u0027s IV.\u003cbr\u003e\u003cbr\u003eIf EVP_EncryptFinal_ex() is subsequently used to obtain the\u003cbr\u003eauthentication tag, the deferred IV setup runs at that point and\u003cbr\u003eclears the running checksum that should have been accumulated over the\u003cbr\u003eplaintext.  The resulting tag is a function of (key, IV) only and\u003cbr\u003everifies against any ciphertext produced under the same (key, IV)\u003cbr\u003epair.\u003cbr\u003e\u003cbr\u003eThe OpenSSL SSL/TLS implementation is not affected: AES-OCB is not a\u003cbr\u003eTLS cipher suite, and libssl does not call EVP_Cipher() in any case.\u003cbr\u003eApplications that drive AES-OCB through the documented streaming AEAD\u003cbr\u003eAPI (EVP_CipherUpdate / EVP_CipherFinal_ex) are not affected.  Only\u003cbr\u003eapplications that combine the AES-OCB cipher with the EVP_Cipher()\u003cbr\u003eone-shot API are vulnerable.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by\u003cbr\u003ethis issue, as AES-OCB is outside the OpenSSL FIPS module boundary."
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          "value": "Issue summary: When an application drives an AES-OCB context through the\npublic EVP_Cipher() one-shot interface, the application-supplied\ninitialisation vector (IV) is silently discarded.\n\nImpact summary: Every message encrypted under the same key uses the\nsame effective nonce regardless of the IV supplied by the caller,\nresulting in (key, nonce) reuse and loss of confidentiality.  If the\nsame code path is used to compute the authentication tag, the tag\ndepends only on the (key, IV) pair and not on the plaintext or\nciphertext, allowing universal forgery of arbitrary ciphertext from a\nsingle captured message.\n\nOpenSSL provides two ways to drive a cipher: the documented streaming\ninterface (EVP_CipherUpdate / EVP_CipherFinal_ex) and a lower-level\none-shot, EVP_Cipher(), whose documentation explicitly recommends\nagainst use by applications in favour of EVP_CipherUpdate() and\nEVP_CipherFinal_ex().  The OCB provider\u0027s streaming handler flushes\nthe application-supplied IV into the OCB context before processing\ndata; the one-shot handler did not.  Every call to EVP_Cipher() on an\nAES-OCB context therefore ran with the all-zero key-derived offset\nstate left by cipher initialisation, regardless of the caller\u0027s IV.\n\nIf EVP_EncryptFinal_ex() is subsequently used to obtain the\nauthentication tag, the deferred IV setup runs at that point and\nclears the running checksum that should have been accumulated over the\nplaintext.  The resulting tag is a function of (key, IV) only and\nverifies against any ciphertext produced under the same (key, IV)\npair.\n\nThe OpenSSL SSL/TLS implementation is not affected: AES-OCB is not a\nTLS cipher suite, and libssl does not call EVP_Cipher() in any case.\nApplications that drive AES-OCB through the documented streaming AEAD\nAPI (EVP_CipherUpdate / EVP_CipherFinal_ex) are not affected.  Only\napplications that combine the AES-OCB cipher with the EVP_Cipher()\none-shot API are vulnerable.\n\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4 and 3.0 are not affected by\nthis issue, as AES-OCB is outside the OpenSSL FIPS module boundary."
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    "assignerShortName": "Moxa",
    "cveId": "CVE-2026-9266",
    "datePublished": "2026-06-12T10:00:33.056Z",
    "dateReserved": "2026-05-22T02:41:04.026Z",
    "dateUpdated": "2026-06-12T13:29:34.626Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}