CVE-2026-5187 — Heap Out-of-Bounds Write in DecodeObjectId() in wolfSSL
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 O…
Published: 2026-04-09 · CVSS: 2.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7