Low 3.8Published Mar 30, 2026

CVE-2025-66215OpenSC: Stack-buffer-overflow WRITE in card-oberthur

Updated under an hour ago (Oct 28, 2026, 2:00 AM ET)

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It affects OpenSC and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for OpenSC

Exploited in the last 30 days

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with physical access to the computer at the time user or administrator uses a token can cause a stack-buffer-overflow WRITE in card-oberthur. The attack requires crafted USB device or smart card that would present the system with specially crafted responses to the APDUs. This issue has been patched in version 0.27.0.

CVSS: 3.8 LOW (v3.1, CNA)CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness (CWE): CWE-121
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OpenSC OpenSC opensc:opensc (from the name)	before 0.27.0	CNA record
opensc_project opensc opensc_project:opensc	before 0.27.0	NVD

References

References

https://github.com/OpenSC/OpenSC/security/advisories/GHSA-q5fc-cw56-hwp2	x-refsource-confirm, patch, vendor-advisory
https://github.com/OpenSC/OpenSC/pull/3436	x-refsource-misc, issue-tracking, patch
https://github.com/OpenSC/OpenSC/commit/efd1d479832141bcf705c2f47655ada4d5f92f5d	x-refsource-misc, patch
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66215	x-refsource-misc, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.