GHSA-MPWR-8VM7-H73F

Vulnerability from github – Published: 2026-08-17 21:56 – Updated: 2026-08-17 21:56
VLAI
Summary
package pkcs12: Authentication bypass in Decode functions
Details

Decode, DecodeChain, DecodeTrustStore, and ToPEM can incorrectly accept PKCS#12 files which were encoded with the wrong password, due to a failure to reject excessively-short PBMAC1 keys. Users who decode PKCS#12 files from untrusted sources and rely on the password for authentication can be tricked into accepting malicious PKCS#12 files. Users who only decode PKCS#12 files from trusted sources are not affected.

Thanks to Pavol Žáčik (Red Hat) and Alex Gaynor (Anthropic) for finding and reporting the same issue in OpenSSL (CVE-2026-34181).

Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "software.sslmate.com/src/go-pkcs12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.6.0"
            },
            {
              "fixed": "0.7.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-17T21:56:01Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "`Decode`, `DecodeChain`, `DecodeTrustStore`, and `ToPEM` can incorrectly accept PKCS#12 files which were encoded with the wrong password, due to a failure to reject excessively-short PBMAC1 keys. Users who decode PKCS#12 files from untrusted sources and rely on the password for authentication can be tricked into accepting malicious PKCS#12 files. Users who only decode PKCS#12 files from trusted sources are not affected.\n\nThanks to Pavol \u017d\u00e1\u010dik (Red Hat) and Alex Gaynor (Anthropic) for finding and reporting the same issue in OpenSSL ([CVE-2026-34181](https://openssl-library.org/news/vulnerabilities/#CVE-2026-34181)).",
  "id": "GHSA-mpwr-8vm7-h73f",
  "modified": "2026-08-17T21:56:01Z",
  "published": "2026-08-17T21:56:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SSLMate/go-pkcs12/security/advisories/GHSA-mpwr-8vm7-h73f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SSLMate/go-pkcs12"
    },
    {
      "type": "WEB",
      "url": "https://openssl-library.org/news/vulnerabilities/#CVE-2026-34181"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "package pkcs12: Authentication bypass in Decode functions"
}



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