# CVE-2026-6094: wolfssl: Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData

CVE-2026-6094 is fixed in wolfssl on 1 platform, first by DEBIAN-CVE-2026-6094, released July 18, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-6094
- Priority: Urgent
- CVSS: 9.1 (critical)
- EPSS: 0.0052
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 25, 2026

## Description

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | wolfssl Debian 12.15 (bookworm) | 5.5.4-2+deb12u3 | [DEBIAN-CVE-2026-6094](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6094.md) | Jul 18, 2026 |
| Linux | wolfssl Debian 13.5 (trixie) | 5.7.2-0.1+deb13u2 | [DEBIAN-CVE-2026-6094](https://patchblox.com/security/data/fix/linux/debian-cve-2026-6094.md) | Jul 18, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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