# CVE-2026-6329: PKCS#12 MAC verification uses attacker-controlled comparison length

> Attackers can bypass PKCS#12 MAC integrity checks by supplying truncated MACs, allowing tampered files to be accepted as valid.

- **Severity:** Medium 6.0 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** DEBIAN-CVE-2026-6329, GHSA-r98j-g9p3-fcgm, JLSEC-2026-747, UBUNTU-CVE-2026-6329

## What is CVE-2026-6329?

CVE-2026-6329 is a medium-severity vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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.

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2026-6329?

It affects 1 product.


Products: Wolfssl Wolfssl.

## How do I fix CVE-2026-6329?

Apply the vendor's patch.

## Is CVE-2026-6329 being exploited?

There is no known exploitation of CVE-2026-6329 in the wild and no public exploit code.

## Other vulnerabilities in Wolfssl Wolfssl

- [CVE-2024-5991](https://insights.sbomify.com/CVE-2024-5991/): Buffer overread in domain name matching (critical 10.0)
- [CVE-2021-37155](https://insights.sbomify.com/CVE-2021-37155/): Security feature bypass in n/a (critical 9.8)
- [CVE-2020-36177](https://insights.sbomify.com/CVE-2020-36177/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2896](https://insights.sbomify.com/CVE-2014-2896/): Memory corruption in n/a (critical 9.8)
- [CVE-2014-2897](https://insights.sbomify.com/CVE-2014-2897/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6329 and fix it if it is affected.

What it is: CVE-2026-6329 is a medium-severity vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-6329 in the wild and no public exploit code.

Affected product: Wolfssl Wolfssl. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-6329/ (Markdown: https://insights.sbomify.com/CVE-2026-6329/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6329
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6329
- OSV: https://osv.dev/vulnerability/CVE-2026-6329

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6329/
Summaries are generated and may contain mistakes; the official description above is the record.