CVE-2019-18224
criticalidn2_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.
Vendor / product: Gnu — libidn2
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.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2019-10-21 17:15
Modified: 2026-10-14 07:16
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnu / libidn2 <2.1.1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00008.html cve@mitre.org
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00009.html cve@mitre.org
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12420 cve@mitre.org
- https://github.com/libidn/libidn2/commit/e4d1558aa2c1c04a05066ee8600f37603890ba8c cve@mitre.org
- https://github.com/libidn/libidn2/compare/libidn2-2.1.0...libidn2-2.1.1 cve@mitre.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... cve@mitre.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... cve@mitre.org
- https://seclists.org/bugtraq/2020/Feb/4 cve@mitre.org
- https://security.gentoo.org/glsa/202003-63 cve@mitre.org
- https://usn.ubuntu.com/4168-1/ cve@mitre.org
- https://www.debian.org/security/2020/dsa-4613 cve@mitre.org
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00008.html af854a3a-2127-422b-91ae-364da2661108
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00009.html af854a3a-2127-422b-91ae-364da2661108
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12420 af854a3a-2127-422b-91ae-364da2661108
- https://github.com/libidn/libidn2/commit/e4d1558aa2c1c04a05066ee8600f37603890ba8c af854a3a-2127-422b-91ae-364da2661108
- https://github.com/libidn/libidn2/compare/libidn2-2.1.0...libidn2-2.1.1 af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... af854a3a-2127-422b-91ae-364da2661108
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/m... af854a3a-2127-422b-91ae-364da2661108
- https://seclists.org/bugtraq/2020/Feb/4 af854a3a-2127-422b-91ae-364da2661108
- https://security.gentoo.org/glsa/202003-63 af854a3a-2127-422b-91ae-364da2661108
- https://usn.ubuntu.com/4168-1/ af854a3a-2127-422b-91ae-364da2661108
- https://www.debian.org/security/2020/dsa-4613 af854a3a-2127-422b-91ae-364da2661108
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗