🛡️ CVE-2026-5187
🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-122 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-122
Public Exploit ✅ No
Source NVD
Published 2026-04-09
Updated 2026-06-02
Modified 2026-04-16
Fix URL N/A

Affected Packages

Software From version Fixed in
wolfssl — 5.9.0

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