CVE-2026-6094 Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedData
Heap buffer overread in wolfSSL PKCS7 parsing allows attackers to cause denial of service or disclose memory via crafted S/MIME or CMS data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-6094?
CVE-2026-6094 is a medium-severity memory corruption vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-6094?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2026-6094?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-6094 being exploited?
There is no known exploitation of CVE-2026-6094 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2026-6094, GHSA-h6gc-rmv2-74g6, JLSEC-2026-744, UBUNTU-CVE-2026-6094.