Is CVE-2026-56412 actively exploited?

No active exploitation of CVE-2026-56412 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-56412 be exploited remotely?

No. CVE-2026-56412 requires local access to exploit.

What is the CVSS score of CVE-2026-56412?

CVE-2026-56412 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-56412

CWE-416Published: June 21, 2026· Updated: Jun 23, 2026

5.9

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:1.3th

Official Description

libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth tracking for various calls from within handlers in cases of a policy violation. Thus, a use-after-free can occur. NOTE: this issue exists because of an incomplete fix for CVE-2026-50219.

NVD Source

Technical Analysis

CVE-2026-56412 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.