VDB-412343 · Submit #956910 · CVE-2026-103531

OpenSC up to 0.27.1 card-setcos.c setcos_construct_fci_44 type_attr stack-based overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.3	$0-$5k	1.29

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenSC up to 0.27.1. This affects the function setcos_construct_fci_44 of the file src/libopensc/card-setcos.c. The manipulation of the argument type_attr leads to stack-based overflow. This vulnerability is listed as CVE-2026-103531. The attack may be initiated remotely. There is no available exploit. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in OpenSC up to 0.27.1. It has been rated as problematic. This issue affects the function setcos_construct_fci_44 of the file src/libopensc/card-setcos.c. The manipulation of the argument type_attr with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-103531. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Applying the patch ad730304052937c32b4eb489a06835ac6123632c is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-90449). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

OpenSC

Version

License

open-source

Website

Product: https://github.com/OpenSC/OpenSC/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: ad730304052937c32b4eb489a06835ac6123632c

Timelineinfo

09/30/2026 Advisory disclosed
09/30/2026 +0 days VulDB entry created
10/01/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 3812
Status: Confirmed

CVE: CVE-2026-103531 (🔒)
GCVE (CVE): GCVE-0-2026-103531
GCVE (VulDB): GCVE-100-412343
EUVD: 🔒

Entryinfo

Created: 09/30/2026 21:11
Updated: 10/01/2026 04:38
Changes: 09/30/2026 21:11 (56), 10/01/2026 04:38 (1)
Complete: 🔍
Submitter: zzxzzb
Cache ID: 216::103

Submitinfo

Accepted

Submit #956910: OpenSC >= 0.12.2 up to and including 0.27.1 (latest release, unfixed; fix approved in PR #3812, pending merge) Buffer Overflow (stack, CWE-121) (by zzxzzb)