CVE-2026-5187

Two potential heap out-of-bounds write locations existed in DecodeObjectId() in wolfcrypt/src/asn.c. First, a bounds check only validates one available slot before writing two OID arc values (out[0] and out[1]), enabling a 2-byte out-of-bounds write when outSz equals 1. Second, multiple callers pass sizeof(decOid) (64 bytes on 64-bit platforms) instead of the element count MAX_OID_SZ (32), causing the function to accept crafted OIDs with 33 or more arcs that write past the end of the allocated buffer.

The following products are affected by CVE-2026-5187 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-5187.

URL	Resource
https://github.com/wolfSSL/wolfssl