{
    "containers": {
        "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<br>systems with AVX-512 and VAES support can trigger an out-of-bounds read<br>of up to 15 bytes when processing partial cipher blocks.<br><br>Impact summary: This out-of-bounds read may trigger a crash which leads to<br>Denial of Service for an application if the input buffer ends at a memory<br>page boundary and the following page is unmapped. There is no information<br>disclosure as the over-read bytes are not written to output.<br><br>The vulnerable code path is only reached when processing partial blocks<br>(when a previous call left an incomplete block and the current call provides<br>fewer bytes than needed to complete it). Additionally, the input buffer<br>must be positioned at a page boundary with the following page unmapped.<br>CFB mode is not used in TLS/DTLS protocols, which use CBC, GCM, CCM, or<br>ChaCha20-Poly1305 instead. For these reasons the issue was assessed as<br>Low severity according to our Security Policy.<br><br>Only x86-64 systems with AVX-512 and VAES instruction support are affected.<br>Other architectures and systems without VAES support use different code<br>paths that are not affected.<br><br>OpenSSL 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": {
                "orgId": "00000000-0000-4000-9000-000000000000",
                "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": "00000000-0000-4000-9000-000000000000",
        "cveId": "CVE-2026-28386",
        "requesterUserId": "00000000-0000-4000-9000-000000000000",
        "serial": 1,
        "state": "PUBLISHED"
    },
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1"
}