GHSA-mpwr-8vm7-h73f package pkcs12: Authentication bypass in Decode functions
Attackers can bypass password authentication in PKCS#12 decoding by using short PBMAC1 keys, allowing malicious files to be accepted as valid.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-mpwr-8vm7-h73f?
GHSA-mpwr-8vm7-h73f is an authentication bypass vulnerability in software.sslmate.com/src/go-pkcs12, published on 22 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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).
Which versions are affected by GHSA-mpwr-8vm7-h73f?
3 open source packages ship an affected version, including software.sslmate.com/src/go-pkcs12.
| Package | Affected | Fixed in |
|---|---|---|
software.sslmate.com/src/go-pkcs12 Go | From 0.6.0 | 0.7.2 |
software.sslmate.com/src/go-pkcs12 Go | From 0.6.0 | 0.7.2 |
software.sslmate.com/src/go-pkcs12 Go | From 0.6.0 | 0.7.2 |
How do I fix GHSA-mpwr-8vm7-h73f?
Upgrade software.sslmate.com/src/go-pkcs12 to 0.7.2 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is GHSA-mpwr-8vm7-h73f being exploited?
There is no known exploitation of GHSA-mpwr-8vm7-h73f in the wild and no public exploit code.
Sources
Also known as GO-2026-5052.