CVE intelligence

CVE-2026-6678

Vulnerability intelligence

Published Jun 25, 2026Sources checked Sep 28, 2026

5.3MEDIUMCVSS out of 10

What this means

Review the available evidence

CVE-2026-6678 and is rated Medium severity with a CVSS score of 5.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS0.3%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-6678?

Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.