Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| OpenSSL | OpenSSL | >= 4.0.0, < 4.0.1; >= 3.6.0, < 3.6.3; >= 3.5.0, < 3.5.7; >= 3.4.0, < 3.4.6 |
References
- https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0fPatch
- https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610Patch
- https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7Patch
- https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81Patch
- https://openssl-library.org/news/secadv/20260609.txtVendor Advisory
Timeline
- Published
- Jun 9, 2026
- Last modified
- Jul 23, 2026
- NVD status
- Analyzed