{
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
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              "content": {
                "id": "CVE-2026-45445",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        {
          "defaultStatus": "unaffected",
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          "vendor": "OpenSSL",
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              "lessThan": "4.0.1",
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              "versionType": "semver"
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        }
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        {
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          "type": "reporter",
          "value": "Alex Gaynor (Anthropic)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Viktor Dukhovni"
        }
      ],
      "datePublic": "2026-06-09T14:00:00.000Z",
      "descriptions": [
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          "supportingMedia": [
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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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          "url": "https://github.com/openssl/openssl/commit/323f0b6e7d530a4cb4336d50c88cb70f3ac2a451"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "AES-OCB IV Ignored on EVP_Cipher() Path",
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    "assignerShortName": "openssl",
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    "datePublished": "2026-06-09T16:03:31.338Z",
    "dateReserved": "2026-05-12T14:34:06.276Z",
    "dateUpdated": "2026-06-10T07:48:10.949Z",
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              "value": "Issue summary: The implementations of AES-SIV (RFC 5297) and AES-GCM-SIV\u003cbr\u003e(RFC 8452) mishandle the authentication of AAD (Additional Authenticated\u003cbr\u003eData) with an empty ciphertext allowing a forgery of such messages.\u003cbr\u003e\u003cbr\u003eImpact summary: An attacker can forge empty messages with arbitrary AAD\u003cbr\u003eto the victim\u0027s application using these ciphers.\u003cbr\u003e\u003cbr\u003eAES-SIV (RFC 5297) and AES-GCM-SIV (RFC 8452) are nonce-misuse-resistant AEAD\u003cbr\u003emodes: they accept a key, nonce, optional AAD (bytes that are authenticated\u003cbr\u003ebut not encrypted), and plaintext, and produces ciphertext plus a 16-byte\u003cbr\u003etag. On decrypt, `EVP_DecryptFinal_ex()` is documented to return success only\u003cbr\u003eif the tag is verified succesfully.\u003cbr\u003e\u003cbr\u003eIn OpenSSL\u0027s provider implementation of these ciphers, the expected tag is\u003cbr\u003ecomputed only when decryption function is invoked with non-empty data.\u003cbr\u003eIf the caller supplies AAD and then calls `EVP_DecryptFinal_ex()` without\u003cbr\u003einvocation of the ciphertext update, which can happen when the received\u003cbr\u003eciphertext length is zero, the tag is never recalculated and still holds its\u003cbr\u003eall-zeros value.\u003cbr\u003e\u003cbr\u003eWhen AES-GCM-SIV is used, an attacker who sends arbitrary AAD, empty\u003cbr\u003eciphertext, and all-zeros tag passes authentication under any key they do not\u003cbr\u003eknow, single-shot. When AES-SIV is used, for mounting the attack it\u0027s\u003cbr\u003enecessary for the application to reuse the decryption context without\u003cbr\u003eresetting the key.\u003cbr\u003e\u003cbr\u003eAES-SIV is implemented since OpenSSL 3.0. AES-GCM-SIV is implemented since\u003cbr\u003eOpenSSL 3.2.\u003cbr\u003e\u003cbr\u003eNo protocols implemented in OpenSSL itself (TLS/CMS/PKCS7/HPKE/QUIC) support\u003cbr\u003eeither AES-GCM-SIV or AES-SIV. To mount an attack, the applications must\u003cbr\u003eimplement their own protocol and use the EVP interface. Also they must skip the\u003cbr\u003eciphertext update when a message with an empty ciphertext arrives.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this\u003cbr\u003eissue, as these algorithms are not FIPS approved and the affected code is\u003cbr\u003eoutside the OpenSSL FIPS module boundary."
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      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes",
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    "dateReserved": "2026-05-12T14:34:06.277Z",
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        "discovery": "UNKNOWN"
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    "dateReserved": "2026-04-29T08:21:07.253Z",
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              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "title": "CISA ADP Vulnrichment"
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          "vendor": "OpenSSL",
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          "type": "reporter",
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              "value": "Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)\u003cbr\u003eprocesses attacker-supplied CMS data, an attacker-chosen stream-mode KEK\u003cbr\u003ecipher can trigger a heap out-of-bounds read in kek_unwrap_key().\u003cbr\u003e\u003cbr\u003eImpact summary: A heap buffer over-read may trigger a crash which leads to\u003cbr\u003eDenial of Service for an application if the input buffer ends at a memory\u003cbr\u003epage boundary and the following page is unmapped. There is no information\u003cbr\u003edisclosure as the over-read bytes are not revealed to the attacker.\u003cbr\u003e\u003cbr\u003eThe key unwrapping function performs a check-byte test as specified in the\u003cbr\u003eRFC that reads 7 bytes from a heap allocation that is based on the wrapped\u003cbr\u003ekey length from the message. There is a minimum length check based on the\u003cbr\u003eblock length of the wrapping cipher. However the cipher is selected from\u003cbr\u003ean OID carried in the attacker\u0027s PWRI keyEncryptionAlgorithm with no\u003cbr\u003erequirement that the cipher be a block cipher. When an attacker selects\u003cbr\u003ea stream-mode cipher the guard will be ineffective and the allocated buffer\u003cbr\u003econtaining the unwrapped key can be too small to fit the check-bytes\u003cbr\u003especified in the RFC and a buffer over-read can happen.\u003cbr\u003e\u003cbr\u003eApplications calling CMS_decrypt() or CMS_decrypt_set1_password()\u003cbr\u003e(equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS\u003cbr\u003edata are vulnerable to this issue. No password knowledge is required: the\u003cbr\u003eover-read happens during the unwrap attempt before any authentication\u003cbr\u003esucceeds.\u003cbr\u003e\u003cbr\u003eThe over-read is limited to a few bytes and is not written to output, so\u003cbr\u003ethere is no information disclosure. Triggering a crash requires the\u003cbr\u003eallocation to border unmapped memory, which is unlikely with the normal\u003cbr\u003eallocator.\u003cbr\u003e\u003cbr\u003eThe FIPS modules are not affected by this issue."
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          "url": "https://github.com/openssl/openssl/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"
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        "discovery": "UNKNOWN"
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    "datePublished": "2026-06-09T16:03:16.306Z",
    "dateReserved": "2026-05-20T12:43:37.677Z",
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