CVE-2026-10275

Name	CVE-2026-10275
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
opensc (PTS)	bullseye	0.21.0-1	vulnerable
	bullseye (security)	0.21.0-1+deb11u1	vulnerable
	bookworm	0.23.0-0.3+deb12u2	vulnerable
	trixie	0.26.1-2	vulnerable
	forky, sid	0.27.1-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
opensc	source	(unstable)	(unfixed)

Notes

[trixie] - opensc <no-dsa> (Minor issue)
[bookworm] - opensc <no-dsa> (Minor issue)
https://github.com/OpenSC/OpenSC/issues/3682
https://github.com/OpenSC/OpenSC/pull/3684
https://github.com/OpenSC/OpenSC/commit/814f745b3b6d100295f65f1935edd33d520d33ab