What’s Vulnerable › Vulnerabilities

CVE-2026-6678: Integer underflow in wc_PKCS7_DecryptOri handling crafted Other Recipient Info

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-25 · updated 2026-07-01
• Weakness: CWE-191

Description

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

Affected products

• wolfSSL: from 3.15.5 before 5.9.2 — fixed in 5.9.2

How to fix

Upgrade to a fixed version: wolfSSL 5.9.2. Check the vendor advisory for mitigations.

References

• https://github.com/wolfSSL/wolfssl/pull/10203
• https://www.wolfssl.com/docs/security-vulnerabilities/
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2408

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