cve.akaoma.com CVE-2026-6094: Heap Buffer Overread Vulnerability in PKCS7 Processing
Article Content
- •CVE-2026-6094 allows unauthenticated attackers to exploit heap buffer overreads.
- •Vulnerability can be triggered via crafted S/MIME or CMS messages.
- •No patch is currently available; monitoring and input validation are recommended.
CVE-2026-6094 is a heap buffer overread vulnerability found in the wc_PKCS7_DecodeEnvelopedData function, which processes crafted PKCS7 EnvelopedData structures. This vulnerability can be exploited by unauthenticated attackers through specially crafted S/MIME or CMS messages, potentially disclosing sensitive data from adjacent memory regions. Currently, there is no public proof-of-concept or evidence of active exploitation. The CVSS base score assigned to this vulnerability is 6.3, indicating a medium severity level. Security teams are advised to monitor for updates from wolfSSL and restrict processing of untrusted S/MIME and CMS messages until a patch is available. Input validation on PKCS7 EnvelopedData structures is also recommended as a precautionary measure. The vulnerability affects systems using wolfSSL versions up to 5.9.1-0.1 on Debian.
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