CVE-2026-40253 — All Token Backends (Soft, ICA, CCA, TPM, EP11, ICSF) Since T Out-of-Bounds $1
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CVE-2026-40253 — openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without v
What This Means For You
- If your environment is affected by CWE-125, review your exposure and prioritize patching based on your environment. Monitor vendor advisories for CVE-2026-40253 updates and patches.
Related ATT&CK Techniques
🛡️ Detection Rules
7 rules · 6 SIEM formats7 auto-generated detection rules for this incident, mapped to MITRE ATT&CK. Available in Sigma, Splunk SPL, Sentinel KQL, Elastic Lucene, QRadar AQL, and Wazuh.
Web Application Exploitation Attempt — CVE-2026-40253
Want this in your SIEM's native format? Get Splunk SPL, Sentinel KQL, Elastic, QRadar AQL, or Wazuh — ready to paste.
7 Sigma rules mapped to the ATT&CK techniques from this breach — pick your SIEM and get a ready-to-paste query.
Get All SIEM Formats →Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-40253 | vulnerability | CVE-2026-40253 |
| CWE-125 | weakness | CWE-125 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 17, 2026 at 02:16 UTC |
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