Medium · CVSS 5.7CVE-2025-13763

Libopensc: opensc: multiple uses of uninitialized variableCVE-2025-13763

Answer in brief

CVE-2025-13763 records a Medium severity (CVSS 5.7) vulnerability in Libopensc: opensc: multiple uses of uninitialized variable. The current sources do not mark it as known exploited. The current feed maps Red Hat/opensc (generic), OpenSC/OpenSC (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 23, 2026Updated Oct 14, 2026Source checked Nov 5, 2026First seen by HOL Jun 25, 2026Material review Oct 14, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.7
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/opensc (generic), OpenSC/OpenSC (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/openscgeneric	*	Not reported
OpenSC/OpenSCgeneric	>=0 <0.27.0	0.27.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/opensc, OpenSC/OpenSC.
Review the reported fix. Source-reported workaround: To mitigate this issue, avoid connecting untrusted USB devices or smart cards to systems running affected versions of Red Hat Enterprise Linux. This operational control reduces the risk of an attacker presenting a specially crafted device to exploit the uninitialized variable flaws in `libopensc`.

Evidence timeline and material changes

Published upstream
Apr 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 25, 2026

Sources and claim methodology

Upstream source 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

Quoted source text, attributed separately from HOL analysis.

NUT blazer_usb ippon_command stack info-leak via unzeroed char tmp[64] in OUT-direction usb_control_msgAlso CWE-457