# CVE-2025-13763: Libopensc: opensc: multiple uses of uninitialized variable

CVE-2025-13763 is fixed in opensc on 1 platform by DEBIAN-CVE-2025-13763 (version 0.27.0~rc1-1), released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-13763
- Priority: Routine
- CVSS: 5.7 (Moderate)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-13763

## Description

Multiple uses of uninitialized variables were found in libopensc that may lead to information disclosure or application crash. An attack requires a crafted USB device or smart card that would present the system with specially crafted responses to the APDUs

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | opensc Debian 14 | 0.27.0~rc1-1 | [DEBIAN-CVE-2025-13763](https://patchblox.com/security/data/fix/linux/debian-cve-2025-13763.md) | May 15, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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