CVE-2025-66037: OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to the fuzz_pkcs15_reader harness causes OpenSC to…

medium6.8CVSS 3.1

AVPACLPRNUINSUCHIHAH

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
debian	opensc	< opensc 0.27.1-1 (forky)	opensc 0.27.1-1 (forky)
opensc	opensc	< 0.27.0	0.27.0
opensc_project	opensc	< 0.27.0	0.27.0
opensc_project	opensc	>= 0 < 0.27.1-1	0.27.1-1

CVSS provenance

nvdv3.16.8MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

osv6.8MEDIUM