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Vulnerabilities / CVE-2019-18224

critical

CVE-2019-18224

libidn2: heap-based buffer overflow in idn2_to_ascii_4i in lib/lookup.c

Published Modified CWE 787
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat5.6CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (medium), Amazon (medium), Ubuntu (medium).

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.

Affected packages and fixed versions

SourcePackageFixed in
alpine 3.12libidn22.1.1-r0
alpine 3.13libidn22.1.1-r0
alpine 3.14libidn22.1.1-r0
alpine 3.15libidn22.1.1-r0
alpine 3.16libidn22.1.1-r0
alpine 3.17libidn22.1.1-r0
alpine 3.18libidn22.1.1-r0
alpine 3.19libidn22.1.1-r0
alpine 3.20libidn22.1.1-r0
alpine 3.21libidn22.1.1-r0
alpine 3.22libidn22.1.1-r0
alpine 3.23libidn22.1.1-r0
Show all 33 entries from 27 sources
SourcePackageFixed in
alpine 3.12libidn22.1.1-r0
alpine 3.13libidn22.1.1-r0
alpine 3.14libidn22.1.1-r0
alpine 3.15libidn22.1.1-r0
alpine 3.16libidn22.1.1-r0
alpine 3.17libidn22.1.1-r0
alpine 3.18libidn22.1.1-r0
alpine 3.19libidn22.1.1-r0
alpine 3.20libidn22.1.1-r0
alpine 3.21libidn22.1.1-r0
alpine 3.22libidn22.1.1-r0
alpine 3.23libidn22.1.1-r0
alpine 3.24libidn22.1.1-r0
alpine edgelibidn22.1.1-r0
amazon linux 1idn22.3.0-1.4.amzn1
amazon linux 1libidn22.3.0-1.4.amzn1
amazon linux 1libidn2-debuginfo2.3.0-1.4.amzn1
amazon linux 1libidn2-devel2.3.0-1.4.amzn1
amazon linux 2idn22.3.0-1.amzn2
amazon linux 2libidn22.3.0-1.amzn2
amazon linux 2libidn2-debuginfo2.3.0-1.amzn2
amazon linux 2libidn2-devel2.3.0-1.amzn2
chainguardlibidn20
debian 10libidn22.0.5-1+deb10u1
debian 11libidn22.2.0-1
debian 12libidn22.2.0-1
debian 13libidn22.2.0-1
debian 14libidn22.2.0-1
echolibidn22.2.0-1
ubuntu 18.04libidn22.0.4-1.1ubuntu0.2
ubuntu 18.04-ESMlibidn22.0.4-1.1ubuntu0.2
ubuntu 19.04libidn22.0.5-1ubuntu0.3
wolfilibidn20

References

All 16 references

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.