USN-8707-1: openCryptoki vulnerabilities
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 po…
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 po…
USN-8707-1: openCryptoki vulnerabilities
Publication date
31 August 2026
Overview
Several security issues were fixed in openCryptoki.
Releases
Packages
- 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)
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
In general, a standard system update will make all the necessary changes.
The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
|
26.04
LTS resolute |
libopencryptoki-dev – | ||
| libopencryptoki0 – | |||
| opencryptoki – | |||
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References
How to Apply the Fix
Update the affected packages on your server to the patched release, then restart the relevant services.
sudo apt update && sudo apt upgradeReferences
Check your system for vulnerabilities
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