CVE-2026-5295
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().
- Affected products
- Wolfssl
- Wolfssl
- < 5.9.1
- CVSS 3.1
- 8.0 HIGH
- EPSS
- 0.2% (7th percentile)
- Weakness
- CWE-121
- NVD status
- Analyzed
- Published
- 2026-04-09
No indexed exploits for CVE-2026-5295 yet
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No exploit for CVE-2026-5295 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.