CVE-2026-10275

OpenSC pkcs11-tool Key Generation pkcs11-tool.c test_kpgen_certwrite buffer overflow

CVE-2026-10275 is fixed in 3 products on 1 platform, first by ALAS2023-2026-1898, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.0

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0030

22nd percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
opensc · Debian 14	0.27.1-2	DEBIAN-CVE-2026-10275	Jun 24, 2026
opensc · amzn 2023	0.24.0-1.amzn2023.0.5	ALAS2023-2026-1898	Jun 22, 2026
opensc · opensuse-leap 16.0	0.26.1-160000.5.1	OPENSUSE-SU-2026:21873-1	Sep 17, 2026
opensc · sles 15.6	0.22.0-150600.11.11.1	SUSE-SU-2026:2697-1	Jun 30, 2026
opensc · sles 15.7	0.22.0-150600.11.11.1	SUSE-SU-2026:2697-1	Jun 30, 2026
opensc-debuginfo · amzn 2023	0.24.0-1.amzn2023.0.5	ALAS2023-2026-1898	Jun 22, 2026
opensc-debugsource · amzn 2023	0.24.0-1.amzn2023.0.5	ALAS2023-2026-1898	Jun 22, 2026

Details

Published
June 1, 2026
Weakness
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-10275

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