OpenSC up to 0.26.x X.509/SPKI sc_pkcs15_pubkey_from_spki_fields out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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3.8$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in OpenSC up to 0.26.x. Affected by this issue is the function sc_pkcs15_pubkey_from_spki_fields of the component X.509/SPKI. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2025-66037. It is feasible to perform the attack on the physical device. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in OpenSC up to 0.26.x. Affected by this vulnerability is the function sc_pkcs15_pubkey_from_spki_fields of the component X.509/SPKI. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-66037 since 11/21/2025. The exploitation appears to be difficult. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.27.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.9
VulDB Meta Temp Score: 3.8

VulDB Base Score: 3.9
VulDB Temp Score: 3.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.9
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Yes
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: OpenSC 0.27.0

Timelineinfo

11/21/2025 CVE reserved
03/30/2026 +128 days Advisory disclosed
03/30/2026 +0 days VulDB entry created
03/30/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-66037 (🔒)
GCVE (CVE): GCVE-0-2025-66037
GCVE (VulDB): GCVE-100-354223

Entryinfo

Created: 03/30/2026 19:47
Changes: 03/30/2026 19:47 (64)
Complete: 🔍
Cache ID: 216:094:103

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