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I. Basic Information for CVE-2026-5504
Vulnerability Information

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Vulnerability Title
PKCS7 CBC Padding Oracle — Plaintext Recovery
Source: NVD (National Vulnerability Database)
Vulnerability Description
A padding oracle exists in wolfSSL's PKCS7 CBC decryption that could allow an attacker to recover plaintext through repeated decryption queries with modified ciphertext. In previous versions of wolfSSL the interior padding bytes are not validated.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
完整性检查值验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
wolfSSL(CyaSSL) 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL(CyaSSL)是美国wolfSSL公司的一个针对嵌入式系统开发人员使用的小的、可移植的嵌入式SSL编程库。 wolfSSL存在安全漏洞,该漏洞源于PKCS7 CBC解密中存在填充预言机,可能导致攻击者通过修改密文进行重复解密查询来恢复明文。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
wolfSSLwolfSSL 0 ~ 5.9.0 -
II. Public POCs for CVE-2026-5504
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III. Intelligence Information for CVE-2026-5504
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IV. Related Vulnerabilities
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