{
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "OpenSSL",
                    "vendor": "OpenSSL",
                    "versions": [
                        {
                            "lessThan": "4.0.1",
                            "status": "affected",
                            "version": "4.0.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.6.3",
                            "status": "affected",
                            "version": "3.6.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.5.7",
                            "status": "affected",
                            "version": "3.5.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.4.6",
                            "status": "affected",
                            "version": "3.4.0",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Pavol Žáčik (Red Hat)"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Alex Gaynor (Anthropic)"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Alicja Kario (Red Hat)"
                }
            ],
            "datePublic": "2026-06-09T14:00:00.000Z",
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input<br>validation for files that use Password-Based Message Authentication Code 1<br>(PBMAC1) integrity mechanism allowing a certificate and private key forgery.<br><br>Impact Summary: An attacker impersonating a user can cause a service reading<br>PKCS#12 files to accept forged certificates and private keys with a 1 in 256<br>probability.<br><br>If a service accepting PKCS#12 files is using passwords for authenticating<br>the received files, the attacker can create unencrypted PKCS#12 files that<br>use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing<br>them to craft a file that will be accepted with a 1 in 256 probability.<br>That would then cause the service to accept a certificate and private key<br>controlled by the attacker.<br><br>The FIPS modules are not affected by this issue, as the affected code is<br>outside the OpenSSL FIPS module boundary."
                        }
                    ],
                    "value": "Issue Summary: The PKCS#12 file processing fails to perform sufficient input\nvalidation for files that use Password-Based Message Authentication Code 1\n(PBMAC1) integrity mechanism allowing a certificate and private key forgery.\n\nImpact Summary: An attacker impersonating a user can cause a service reading\nPKCS#12 files to accept forged certificates and private keys with a 1 in 256\nprobability.\n\nIf a service accepting PKCS#12 files is using passwords for authenticating\nthe received files, the attacker can create unencrypted PKCS#12 files that\nuse PBMAC1 authentication that specifies an HMAC key of only one byte, allowing\nthem to craft a file that will be accepted with a 1 in 256 probability.\nThat would then cause the service to accept a certificate and private key\ncontrolled by the attacker.\n\nThe FIPS modules are not affected by this issue, as the affected code is\noutside the OpenSSL FIPS module boundary."
                }
            ],
            "metrics": [
                {
                    "format": "other",
                    "other": {
                        "content": {
                            "text": "Low"
                        },
                        "type": "https://openssl-library.org/policies/general/security-policy/"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-354",
                            "description": "CWE-354 Improper Validation of Integrity Check Value",
                            "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/20260609.txt"
                },
                {
                    "name": "4.0.1 git commit",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f"
                },
                {
                    "name": "3.6.3 git commit",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81"
                },
                {
                    "name": "3.5.7 git commit",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7"
                },
                {
                    "name": "3.4.6 git commit",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys",
            "x_generator": {
                "engine": "Vulnogram 0.2.0"
            }
        }
    },
    "cveMetadata": {
        "assignerOrgId": "00000000-0000-4000-9000-000000000000",
        "cveId": "CVE-2026-34181",
        "requesterUserId": "00000000-0000-4000-9000-000000000000",
        "serial": 1,
        "state": "PUBLISHED"
    },
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1"
}