# CVE-2026-6329 — wolfSSL

> As of 2026-06-26, CVE-2026-6329 is a MEDIUM-severity vulnerability in wolfSSL, CVSS v3.1 6.5, EPSS 0.2% (10.8th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-6329 as of 2026-06-26; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-06-26

## What is CVE-2026-6329?

PKCS#12 MAC verification uses an attacker-controlled comparison length, weakening the integrity check on the MAC and allowing a mismatched MAC to be accepted. The PKCS#12 verify path compared the locally computed HMAC against the MAC parsed from the PKCS#12 structure using a length taken directly from the attacker-supplied input, without first verifying that it equals the length of the digest actually produced by the configured algorithm. A truncated or zero-length stored MAC could therefore be accepted, defeating the integrity protection of the MAC.

The record classifies CVE-2026-6329 under weakness class [CWE-347](https://intel.threadlinqs.com/cwe/CWE-347). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 102 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 6.5 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **CVSS v4.0 base score:** 6 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 10.8% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-06-25, last modified 2026-06-26

## Is CVE-2026-6329 being exploited?

It currently carries a trending score of 32 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [wolfSSL](https://intel.threadlinqs.com/vendors/wolfssl): wolfSSL

## How to fix CVE-2026-6329

The record marks a vendor fix as available for CVE-2026-6329. Patch reference: [https://github.com/wolfSSL/wolfssl/pull/10192](https://github.com/wolfSSL/wolfssl/pull/10192). Vendor advisory: [https://www.wolfssl.com/docs/security-vulnerabilities/](https://www.wolfssl.com/docs/security-vulnerabilities/). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-6329

No threat campaign in the Threadlinqs corpus currently references CVE-2026-6329, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-06-28. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com — patch](https://github.com/wolfSSL/wolfssl/pull/10192)

**Other references**

- [wolfssl.com](https://www.wolfssl.com/docs/security-vulnerabilities/)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-6329
Full detection coverage and IOCs for threats exploiting CVE-2026-6329 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp