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[USN-8707-1] openCryptoki vulnerabilities

Posted on 01 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8707-1
August 31, 2026

opencryptoki vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

Several security issues were fixed in openCryptoki.

Software Description:
- opencryptoki: A PKCS#11 Cryptographic Token Interface Standard implementation.

Details:

It was discovered that primitive decoders in openCryptoki produced integer
underflows when the encoded length was zero. An attacker could possibly use
this issue to trigger out-of-bounds reads. (CVE-2026-40253)

It was discovered that openCryptoki incorrectly handled symlinks. An
attacker in the token-group could possibly use this issue to achieve
privilege escalation or access sensitive information. (CVE-2026-23893)

It was discovered that the CKM_ECDH_AES_KEY_WRAP implementation had a heap
buffer overflow vulnerability. An attacker could possibly use this issue to
trigger heap corruption, or denial-of-service. (CVE-2026-22791)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libopencryptoki-dev 3.26.0+dfsg-0ubuntu1.1
libopencryptoki0 3.26.0+dfsg-0ubuntu1.1
opencryptoki 3.26.0+dfsg-0ubuntu1.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8707-1
CVE-2026-22791, CVE-2026-23893, CVE-2026-40253

Package Information:
https://launchpad.net/ubuntu/+source/opencryptoki/3.26.0+dfsg-0ubuntu1.1

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