---
id: GHSA-mpwr-8vm7-h73f
title: 'package pkcs12: Authentication bypass in Decode functions'
summary: 'package pkcs12: Authentication bypass in Decode functions'
severity: medium
cwe:
  - CWE-20
vendor: src
product: software.sslmate.com/src/go-pkcs12
ecosystem: go
affected:
  - 'software.sslmate.com/src/go-pkcs12 >= 0.6.0, < 0.7.2'
patched:
  - software.sslmate.com/src/go-pkcs12 0.7.2
published: '2026-08-17'
updated: '2026-08-17'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-mpwr-8vm7-h73f'
references:
  - url: >-
      https://github.com/SSLMate/go-pkcs12/security/advisories/GHSA-mpwr-8vm7-h73f
  - url: 'https://openssl-library.org/news/vulnerabilities/#CVE-2026-34181'
  - url: 'https://github.com/advisories/GHSA-mpwr-8vm7-h73f'
tags:
  - ghsa
  - go
ingestedAt: '2026-08-17T22:01:16.855Z'
---

## Overview

`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](https://openssl-library.org/news/vulnerabilities/#CVE-2026-34181)).

## Affected packages

- `software.sslmate.com/src/go-pkcs12 >= 0.6.0, < 0.7.2`

## Remediation

Upgrade to a patched release:

- `software.sslmate.com/src/go-pkcs12 0.7.2`