What’s Vulnerable › Vulnerabilities

CVE-2026-10275: OpenSC pkcs11-tool Key Generation pkcs11-tool.c test_kpgen_certwrite buffer overflow

• Severity: medium (CVSS 5.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-119

Description

A flaw has been found in OpenSC up to 0.26.1. This affects the function test_kpgen_certwrite of the file src/tools/pkcs11-tool.c of the component pkcs11-tool Key Generation Module. This manipulation causes buffer overflow. The attack is possible to be carried out remotely. The complexity of an attack is rather high. It is indicated that the exploitability is difficult. The exploit has been published and may be used. Patch name: 814f745b3b6d100295f65f1935edd33d520d33ab. It is recommended to apply a patch to fix this issue.

Affected products

• opensc: 0.26.0, 0.26.1

References

• https://github.com/OpenSC/OpenSC/
• https://github.com/OpenSC/OpenSC/commit/814f745b3b6d100295f65f1935edd33d520d33ab
• https://github.com/OpenSC/OpenSC/issues/3682
• https://github.com/OpenSC/OpenSC/pull/3684
• https://pan.baidu.com/s/1nrZPKDz2eAcCpsaFiIRlrg
• https://vuldb.com/cve/CVE-2026-10275
• https://vuldb.com/submit/825403
• https://vuldb.com/vuln/367568
• https://vuldb.com/vuln/367568/cti

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