Medium 6.8Published Mar 30, 2026

CVE-2025-66037OpenSC is an open source smart card tools and middleware.

Updated under an hour ago (2026-10-19 06:50 UTC)

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It affects opensc_project opensc. 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_project opensc

Exploited in the last 30 days

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.

CVSS: 6.8 MEDIUM (v3.1, NVD)CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

opensc_project opensc opensc_project:opensc	before 0.27.0	NVD

References

https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfxexploit, vendor-advisory
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037vendor-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.