CVE-2026-6678 Integer underflow in wc_PKCS7_DecryptOri handling crafted Other Recipient Info
An integer underflow in wolfSSL's PKCS7 decryption allows attackers to cause memory corruption or crashes via crafted recipient info.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-6678?
CVE-2026-6678 is a low-severity vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.
Weakness: CWE-191
Which versions are affected by CVE-2026-6678?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2026-6678?
Apply the vendor's patch.
Is CVE-2026-6678 being exploited?
There is no known exploitation of CVE-2026-6678 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2026-6678, GHSA-p894-8wv9-373j, JLSEC-2026-752, UBUNTU-CVE-2026-6678.