--- title: 'USN-8707-1: openCryptoki vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-8707-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-8707-1 --- # USN-8707-1: openCryptoki vulnerabilities Publication date 31 August 2026 Overview Several security issues were fixed in openCryptoki. Releases [26.04 LTS](https://ubuntu.com/security/notices?release=resolute) --- Open side navigation ## Packages * [opencryptoki](https://ubuntu.com/security/cves?package=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](https://ubuntu.com/security/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](https://ubuntu.com/security/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](https://ubuntu.com/security/CVE-2026-22791)) ## Update instructions In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 26.04 LTS resolute | [libopencryptoki-dev](https://launchpad.net/ubuntu/+source/opencryptoki) –  [3.26.0+dfsg-0ubuntu1.1](https://launchpad.net/ubuntu/+source/opencryptoki/3.26.0+dfsg-0ubuntu1.1) | | | | [libopencryptoki0](https://launchpad.net/ubuntu/+source/opencryptoki) –  [3.26.0+dfsg-0ubuntu1.1](https://launchpad.net/ubuntu/+source/opencryptoki/3.26.0+dfsg-0ubuntu1.1) | | | | [opencryptoki](https://launchpad.net/ubuntu/+source/opencryptoki) –  [3.26.0+dfsg-0ubuntu1.1](https://launchpad.net/ubuntu/+source/opencryptoki/3.26.0+dfsg-0ubuntu1.1) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2026-40253](https://ubuntu.com/security/CVE-2026-40253) * [CVE-2026-23893](https://ubuntu.com/security/CVE-2026-23893) * [CVE-2026-22791](https://ubuntu.com/security/CVE-2026-22791) ## Related notices * [USN-8686-1](https://ubuntu.com/security/notices/USN-8686-1)