CVE-2026-34181

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Source
https://cve.org/CVERecord?id=CVE-2026-34181
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34181.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-34181
Downstream
ALPINE (1)
ALSA (2)
BELL (1)
CGA (28)
DEBIAN (1)
ECHO (1)
JLSEC (1)
MGASA (1)
MINI (1)
openSUSE (2)
RHSA (10)
RLSA (2)
SUSE (4)
UBUNTU (1)
Related
ALSA (2)
openSUSE (2)
SUSE (4)
Published
2026-06-09T16:03:22Z
Modified
2026-10-28T11:12:06Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys
Details

Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery.

Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability.

If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker.

The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

Database specific 
{
    "cna_assigner": "openssl",
    "cwe_ids": [
        "CWE-354"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34181.json"
}
References

Affected packages

Git / github.com/openssl/openssl

Affected ranges

Type
GIT
Repo
https://github.com/openssl/openssl
Events
Introduced
98acb6b02839c609ef5b837794e08d906d965335
Fixed
c5ea1cc227fd60afae8ac4b9438690bbe4888f79
Introduced
636dfadc70ce26f2473870570bfd9ec352806b1d
Fixed
8cf17aaeb4599f8af87fefd810b5b5fee90fe69e
Introduced
7b371d80d959ec9ab4139d09d78e83c090de9779
Fixed
aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f
Introduced
11b7b6ea3b65a584e1d31408ed1bdb139465cffd
Fixed
0300eb9ddce7a0895bf301a4b0c03a9da2313a0f
Fixed
79eb76a937e474bb7610a0a3dc57131dc8dc6610
Fixed
85dcbb3abaa4878af5c8fbbe11bce708fcf984a7
Fixed
ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.4.0"
                },
                {
                    "fixed": "3.4.6"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.5.0"
                },
                {
                    "fixed": "3.5.7"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "3.6.0"
                },
                {
                    "fixed": "3.6.3"
                }
            ],
            "source": "CPE_RANGE"
        },
        {
            "cpe": "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*",
            "range": [
                {
                    "introduced": "4.0.0-NA"
                },
                {
                    "last_affected": "4.0.0-NA"
                }
            ],
            "source": "CPE_STRING"
        },
        {
            "range": [
                {
                    "fixed": "0300eb9ddce7a0895bf301a4b0c03a9da2313a0f"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "79eb76a937e474bb7610a0a3dc57131dc8dc6610"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "85dcbb3abaa4878af5c8fbbe11bce708fcf984a7"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "range": [
                {
                    "fixed": "ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

3.*
3.4-POST-CLANG-FORMAT-WEBKIT
3.4-PRE-CLANG-FORMAT-WEBKIT
3.5-POST-CLANG-FORMAT-WEBKIT
3.5-PRE-CLANG-FORMAT-WEBKIT
3.6-POST-CLANG-FORMAT-WEBKIT
3.6-PRE-CLANG-FORMAT-WEBKIT
4.*
4.0.0-NA
openssl-3.*
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.4.4
openssl-3.4.5
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.5.5
openssl-3.5.6
openssl-3.6.0
openssl-3.6.1
openssl-3.6.2
openssl-4.*
openssl-4.0.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34181.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "315812236523225321135455598472506362094",
            "length": 1300
        },
        "id": "CVE-2026-34181-10a23314",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c",
            "function": "PBMAC1_PBKDF2_HMAC"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "315812236523225321135455598472506362094",
            "length": 1300
        },
        "id": "CVE-2026-34181-179c423c",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c",
            "function": "PBMAC1_PBKDF2_HMAC"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "76940837782890555457350612104326271031",
            "length": 1377
        },
        "id": "CVE-2026-34181-30fef3db",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c",
            "function": "PBMAC1_PBKDF2_HMAC"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "279241462574763049619469167939590085965",
                "124667758924786016762543144623160633643",
                "19236051917043646048645916126187618535",
                "231367928065682063288219806662093847496",
                "49790318440299563265754245713723343566",
                "277242367734218736396726487976444044573",
                "147519211957771243650362882755125492373"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-34181-4b6dc014",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "279241462574763049619469167939590085965",
                "124667758924786016762543144623160633643",
                "19236051917043646048645916126187618535",
                "231367928065682063288219806662093847496",
                "49790318440299563265754245713723343566",
                "277242367734218736396726487976444044573",
                "147519211957771243650362882755125492373"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-34181-caddfd8e",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "315812236523225321135455598472506362094",
            "length": 1300
        },
        "id": "CVE-2026-34181-d817c3cb",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c",
            "function": "PBMAC1_PBKDF2_HMAC"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "279241462574763049619469167939590085965",
                "124667758924786016762543144623160633643",
                "19236051917043646048645916126187618535",
                "109311854025605999266541078181181050843",
                "233208125156034602449654152202759626898",
                "50266223505594140671587537528415171907",
                "183383251099508880019909697272539267262",
                "148499316838314248044771824359462163836"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-34181-dd5b877a",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "279241462574763049619469167939590085965",
                "124667758924786016762543144623160633643",
                "19236051917043646048645916126187618535",
                "231367928065682063288219806662093847496",
                "49790318440299563265754245713723343566",
                "277242367734218736396726487976444044573",
                "147519211957771243650362882755125492373"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-34181-f1fe0dd4",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610",
        "target": {
            "file": "crypto/pkcs12/p12_mutl.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T11:12:06Z"