Threat Intelligence / CVE / CVE-2026-56412

CVE-2026-56412

CVSS 4.9 (MEDIUM) · Priority 2.5/10 · Published 2026-06-21

As of 2026-06-22, CVE-2026-56412 is a CVSS 4.9 (MEDIUM-severity) vulnerability. Threadlinqs Intelligence tracks 0 threats exploiting it.

Last updated: 2026-06-22

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.

CVSS v3 vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Weaknesses (CWE)

CWE-416

References

https://github.com/libexpat/libexpat/pull/1278

Full detection coverage & IOCs for threats exploiting CVE-2026-56412 are available via the Threadlinqs MCP server (Purple tier). View plans →

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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.