Out-of-bounds read in Opencryptoki - CVE-2026-40253
Published: April 14, 2026
Vulnerability identifier: #VU125982
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-40253
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Opencryptoki Project
Affected software:
Opencryptoki
Opencryptoki
Detailed vulnerability description
The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.
The vulnerability exists due to out-of-bounds read in BER/DER decoding functions in usr/lib/common/asn1.c when parsing malformed BER-encoded cryptographic objects with attacker-controlled length fields. A remote attacker can supply a specially crafted key or certificate to disclose sensitive information and cause a denial of service.
The issue affects the shared common library and impacts all token backends, including Soft, ICA, CCA, TPM, EP11, and ICSF.
How to mitigate CVE-2026-40253
Install security update from vendor's website.