CVE-2026-40253

medium Red Hat
CVSS v3 Base Score
6.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
EPSS Score
0.0%
Exploitation probability in 30 days
Top 95% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
None
Availability
High
Published: April 16, 2026 (84 days ago)
Last Modified: April 16, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in openCryptoki, a PKCS#11 (Cryptographic Token Interface Standard) library. The BER/DER (Basic Encoding Rules/Distinguished Encoding Rules) decoding functions in the shared common library do not properly validate attacker-controlled length fields against actual buffer boundaries. This allows an attacker to supply a malformed BER-encoded cryptographic object, potentially through PKCS#11 operations, token loading, or remote backend communication. This can lead to out-of-bounds reads and integer underflows, resulting in information disclosure and a denial of service.

CWE

CWE-125

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 7Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 github.com 🔗 github.com