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Ubuntu Security NoticesUSN-8686-1

USN-8686-1: 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 possibly use this issue to achieve privilege escalation or access sensitive information. (CVE-2026-23893)

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Scope

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  1. Published by Ubuntu

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  2. Added to SecurityAlert

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  3. Confirmed at the source

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Vulnerabilities

CVEs named in this advisory

CVE-2026-40253View CVSS, KEV, EPSS, and threat contextCVE-2026-23893View CVSS, KEV, EPSS, and threat context
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