PT-2026-31822 · Wolfssl · Wolfssl

Seunghyun Yoon + 2 · Published 2026-04-09 · Updated 2026-04-14 · CVE-2026-5295

Positive Technologies (AI Summary)

CVSS v3.1

8.0

High

Base vector

AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions wolfSSL versions (affected versions not specified)

Description A stack buffer overflow exists in wolfSSL's PKCS7 implementation within the wc PKCS7 DecryptOri() function located in wolfcrypt/src/pkcs7.c. The issue occurs when processing a CMS EnvelopedData message with an OtherRecipientInfo (ORI) recipient. The function uses XMEMCPY to copy an ASN.1-parsed OID into a fixed 32-byte stack buffer (oriOID[MAX OID SZ]) without validating the length of the OID. A crafted CMS EnvelopedData message containing an OID longer than 32 bytes triggers the overflow. Exploitation requires the library to be built with --enable-pkcs7 and an ORI decrypt callback registered via wc PKCS7 SetOriDecryptCb().

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-5295

Affected Products

Wolfssl

References · 9

• https://github.com/wolfSSL/wolfssl/pull/10116 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-5295 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-5295 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2026-5295 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-5295 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-5295 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-5295 · Vendor Advisory
• https://twitter.com/VulmonFeeds/status/2044054701021212713 · Twitter Post
• https://twitter.com/CVEnew/status/2042387939242754554 · Twitter Post