TI-2025-40563 Aliases CVE-2025-66037

OpenSC: Out of Bounds vulnerability

MEDIUM 63CWE-125Published 2026-03-30 · Updated 2026-03-30

Key facts

Attack vector: Physical
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00263 18th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial OpenSC (OpenSC): 0.27.0Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenSC	OpenSC	before 0.27.0	0.27.0	Patch available	CNA

OpenSC VendorOpenSC Affected before 0.27.0 Fixed in 0.27.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:opensc_project:opensc::::::::	before 0.27.0	Vulnerable	OpenSC

cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:* Versions before 0.27.0 Vulnerable ·OpenSC

Remediation

Fix · CNA OpenSC (OpenSC) Fixed in 0.27.0

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2025-66037

References

Exploit 1

https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfx

Advisory 1

https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037

TI-2025-40564 OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers CVSS 3.1MEDIUM 6.8
TI-2019-04558 sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory leak, as demonstrated by a call from eidenv. CVSS 3.0HIGH 7.5
TI-2021-13306 Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs. CVSS 3.1HIGH 7.5
TI-2019-12067 An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC. CVSS 3.0HIGH 7.5
TI-2023-21453 Opensc: potential pin bypass when card tracks its own login state CVSS 3.1MEDIUM 6.6
TI-2023-21454 Opensc: multiple memory issues with pkcs15-init (enrollment tool) CVSS 3.1MEDIUM 6.4

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences