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CVE-2026-5295— Stack Buffer Overflow in wolfSSL PKCS7 wc_PKCS7_DecryptOri() via Oversized OID

EPSS 0.02% · P4
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I. Basic Information for CVE-2026-5295

Vulnerability Information
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Vulnerability Title
Stack Buffer Overflow in wolfSSL PKCS7 wc_PKCS7_DecryptOri() via Oversized OID
Source: NVD (National Vulnerability Database)
Vulnerability Description
A stack buffer overflow exists in wolfSSL's PKCS7 implementation in the wc_PKCS7_DecryptOri() function in wolfcrypt/src/pkcs7.c. When processing a CMS EnvelopedData message containing an OtherRecipientInfo (ORI) recipient, the function copies an ASN.1-parsed OID into a fixed 32-byte stack buffer (oriOID[MAX_OID_SZ]) via XMEMCPY without first validating that the parsed OID length does not exceed MAX_OID_SZ. A crafted CMS EnvelopedData message with an ORI recipient containing an OID longer than 32 bytes triggers a stack buffer overflow. Exploitation requires the library to be built with --enable-pkcs7 (disabled by default) and the application to have registered an ORI decrypt callback via wc_PKCS7_SetOriDecryptCb().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
wolfSSL 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wc_PKCS7_DecryptOri函数中的PKCS7实现存在栈缓冲区溢出，可能导致处理包含OtherRecipientInfo接收者的CMS EnvelopedData消息时触发栈缓冲区溢出。
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 ~ 5.9.1 -

II. Public POCs for CVE-2026-5295

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III. Intelligence Information for CVE-2026-5295

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Same Patch Batch · wolfSSL · 2026-04-09 · 16 CVEs total

CVE-2026-5263URI nameConstraints not enforced in ConfirmNameConstraints()
CVE-2026-5187Heap Out-of-Bounds Write in DecodeObjectId() in wolfSSL
CVE-2026-5264DTLS 1.3 ACK heap buffer overflow
CVE-2026-5393OOB Read in DoTls13CertificateVerify with WOLFSSL_DUAL_ALG_CERTS
CVE-2026-5446wolfSSL ARIA-GCM TLS 1.2/DTLS 1.2 GCM nonce reuse
CVE-2026-5504PKCS7 CBC Padding Oracle — Plaintext Recovery
CVE-2026-5447Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier
CVE-2026-5778Integer underflow leads to out-of-bounds access in sniffer ChaCha decrypt path.
CVE-2026-5772MatchDomainName 1-Byte Stack Buffer Over-Read in Hostname Validation
CVE-2026-5507Session Cache Restore — Arbitrary Free via Deserialized Pointer
CVE-2026-5194wolfSSL ECDSA Certificate Verification
CVE-2026-5392wolfSSL heap OOB read in PKCS7 SignedData streaming
CVE-2026-5460Heap Use-After-Free in PQC Hybrid KeyShare Error Cleanup in wolfSSL TLS 1.3
CVE-2026-5503out-of-bounds write in TLSX_EchChangeSNI via attacker-controlled publicName
CVE-2026-54481-2 Byte Buffer Overflow in wolfSSL_X509_notAfter/notBefore

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-121

V. Comments for CVE-2026-5295

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