Weakness in PKCS#12 MAC Verification in WolfSSL Products
CVE-2026-6329

6MEDIUM

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
25 June 2026

What is CVE-2026-6329?

The vulnerability in PKCS#12 MAC verification arises from a flaw in length comparison, where an attacker can manipulate the comparison length used during the integrity check. This leads to a situation where a mismatched MAC can be wrongly accepted, undermining the integrity of the MAC. When the PKCS#12 verify path computes the HMAC locally, it compares it to the MAC retrieved from the PKCS#12 file, using a length determined by attacker-controlled input. This can allow for acceptance of truncated or incorrectly specified MACs, negating the intended security protections.

Affected Version(s)

wolfSSL 3.10.0 <= 5.9.1

References

https://github.com/wolfSSL/wolfssl/pull/10192
patch
https://www.wolfssl.com/docs/security-vulnerabilities/

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Nicholas Carlini from Anthropic
.