Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-18224

CVE-2019-18224CRITICAL

n/a n/a — idn2_to_ascii_4i in lib/lookup.c in GNU libidn2 before 2.1.1 has a heap-based buffer overflow via a long domain string.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .0371   89.6     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Oct 21  Reserved by mitre
  Oct 21  Published (CNA: mitre)
  Oct 14  ENRICHED — CVE-2019-18224. Received CVSS 9.8 and CPE data from NVD.
  Oct 14  EXPLOIT PUBLISHED — CVE-2019-18224. Public exploit reference added.

CWE-787 · CNA: mitre · CVSS v3.1 · 12 references · NVD status: Modified

Description

idn2_to_ascii_4i in lib/lookup.c in GNU libidn2 before 2.1.1 has a heap-based buffer overflow via a long domain string.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
October 21, 2019	Reserved	Reserved by mitre
October 21, 2019	Published	Published (CNA: mitre)
October 14, 2026	ENRICHED	ENRICHED — CVE-2019-18224. Received CVSS 9.8 and CPE data from NVD.
October 14, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2019-18224. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-787

References (12)

Authoritative record: CVE-2019-18224 at cve.org

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-18224 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.