{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.1,
              "baseSeverity": "CRITICAL",
              "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:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-28386",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-10T20:15:21.235876Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-10T20:16:08.389Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "OpenSSL",
          "vendor": "OpenSSL",
          "versions": [
            {
              "lessThan": "3.6.2",
              "status": "affected",
              "version": "3.6.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Stanislav Fort (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Pavel Kohout (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Alex Gaynor (Anthropic)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Stanislav Fort (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Pavel Kohout (Aisle Research)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Alex Gaynor (Anthropic)"
        }
      ],
      "datePublic": "2026-04-07T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Issue summary: Applications using AES-CFB128 encryption or decryption on\u003cbr\u003esystems with AVX-512 and VAES support can trigger an out-of-bounds read\u003cbr\u003eof up to 15 bytes when processing partial cipher blocks.\u003cbr\u003e\u003cbr\u003eImpact summary: This out-of-bounds 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 written to output.\u003cbr\u003e\u003cbr\u003eThe vulnerable code path is only reached when processing partial blocks\u003cbr\u003e(when a previous call left an incomplete block and the current call provides\u003cbr\u003efewer bytes than needed to complete it). Additionally, the input buffer\u003cbr\u003emust be positioned at a page boundary with the following page unmapped.\u003cbr\u003eCFB mode is not used in TLS/DTLS protocols, which use CBC, GCM, CCM, or\u003cbr\u003eChaCha20-Poly1305 instead. For these reasons the issue was assessed as\u003cbr\u003eLow severity according to our Security Policy.\u003cbr\u003e\u003cbr\u003eOnly x86-64 systems with AVX-512 and VAES instruction support are affected.\u003cbr\u003eOther architectures and systems without VAES support use different code\u003cbr\u003epaths that are not affected.\u003cbr\u003e\u003cbr\u003eOpenSSL FIPS module in 3.6 version is affected by this issue."
            }
          ],
          "value": "Issue summary: Applications using AES-CFB128 encryption or decryption on\nsystems with AVX-512 and VAES support can trigger an out-of-bounds read\nof up to 15 bytes when processing partial cipher blocks.\n\nImpact summary: This out-of-bounds read may trigger a crash which leads to\nDenial of Service for an application if the input buffer ends at a memory\npage boundary and the following page is unmapped. There is no information\ndisclosure as the over-read bytes are not written to output.\n\nThe vulnerable code path is only reached when processing partial blocks\n(when a previous call left an incomplete block and the current call provides\nfewer bytes than needed to complete it). Additionally, the input buffer\nmust be positioned at a page boundary with the following page unmapped.\nCFB mode is not used in TLS/DTLS protocols, which use CBC, GCM, CCM, or\nChaCha20-Poly1305 instead. For these reasons the issue was assessed as\nLow severity according to our Security Policy.\n\nOnly x86-64 systems with AVX-512 and VAES instruction support are affected.\nOther architectures and systems without VAES support use different code\npaths that are not affected.\n\nOpenSSL FIPS module in 3.6 version is affected by this issue."
        }
      ],
      "metrics": [
        {
          "format": "other",
          "other": {
            "content": {
              "text": "Low"
            },
            "type": "https://openssl-library.org/policies/general/security-policy/"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-07T22:00:50.164Z",
        "orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "shortName": "openssl"
      },
      "references": [
        {
          "name": "OpenSSL Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://openssl-library.org/news/secadv/20260407.txt"
        },
        {
          "name": "3.6.2 git commit",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openssl/openssl/commit/61f428a2fc6671ede184a19f71e6e495f0689621"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Out-of-bounds Read in AES-CFB-128 on X86-64 with AVX-512 Support",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
    "assignerShortName": "openssl",
    "cveId": "CVE-2026-28386",
    "datePublished": "2026-04-07T22:00:50.164Z",
    "dateReserved": "2026-02-27T13:45:02.161Z",
    "dateUpdated": "2026-04-10T20:16:08.389Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}