CVE-2026-6678

CVE

Threat entity extracted from intelligence sources

Frequency

occurrences

First Seen

June 26, 2026

Last Seen

June 26, 2026

API

Exploited in Wild

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Ransomware Use

—

Public Exploits

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Attack Vector

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Vulnerability Overview

Exploitation Activity

Exploitation Intelligence

CVE-2026-6678: Integer Underflow Vulnerability in PKCS#7 Decryption42.9

CVE-2026-6678 is an integer underflow vulnerability in the wc_PKCS7_DecryptOri function, affecting systems that process PKCS#7 messages. An unauthenticated attacker can exploit this vulnerability by sending crafted messages with malformed Other Recipient Info, leading to potential disclosure of sens...