CVE catalog

CVE-2019-12290

libidn2: CVE-2019-12290

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C
Published: Oct 22, 2019, 4:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 3.23% · Oct 25, 2026

GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the inclusion of certain punycoded Unicode characters (that would be discarded when converted first to a Unicode label and then back to an ASCII label), arbitrary domains can be impersonated.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libidn2	sid	`2.3.8-5`	fixed
Debian	libidn2	forky	`2.3.8-5`	fixed
Debian	libidn2	trixie	`2.3.8-2`	fixed
Debian	libidn2	bookworm	`2.3.3-1`	fixed
Cpe	libidn2	Not reported	`2.2.0`	fixed
Alpine	libidn2	3.12	`2.2.0-r0`	fixed
Alpine	libidn2	3.13	`2.2.0-r0`	fixed
Alpine	libidn2	3.14	`2.2.0-r0`	fixed
Alpine	libidn2	3.15	`2.2.0-r0`	fixed
Alpine	libidn2	3.16	`2.2.0-r0`	fixed
Alpine	libidn2	3.17	`2.2.0-r0`	fixed
Alpine	libidn2	3.18	`2.2.0-r0`	fixed
Alpine	libidn2	3.19	`2.2.0-r0`	fixed
Alpine	libidn2	3.20	`2.2.0-r0`	fixed
Alpine	libidn2	3.21	`2.2.0-r0`	fixed
Alpine	libidn2	3.22	`2.2.0-r0`	fixed
Alpine	libidn2	3.23	`2.2.0-r0`	fixed
Alpine	libidn2	3.24	`2.2.0-r0`	fixed
Ubuntu	libidn2	18.04	`2.0.4-1`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1.1`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1.1build2`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1.1ubuntu0.2`	fixed
Ubuntu	libidn2-0	pro	`0.10-3`	vulnerable
Ubuntu	libidn2-0	pro	`0.10-3ubuntu0.1~esm1`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1.1`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1.1build2`	vulnerable
Ubuntu	libidn2	18.04	`2.0.4-1.1ubuntu0.2`	fixed
Opensuse	libidn2	leap 15.0	`2.2.0-lp150.2.3.1`	fixed
Suse	libidn2	linux enterprise module for basesystem 15	`2.2.0-3.3.1`	fixed
Suse	libidn2	linux enterprise module for basesystem 15 sp1	`2.2.0-3.3.1`	fixed
Opensuse	libidn2	leap 15.1	`2.2.0-lp151.3.3.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libidn2	source	sid	`2.2.0-1`	not yet assigned	Not reported	Not reported
Debian	libidn2	source	forky	`2.2.0-1`	not yet assigned	Not reported	Not reported
Debian	libidn2	source	trixie	`2.2.0-1`	not yet assigned	Not reported	Not reported
Debian	libidn2	source	bookworm	`2.2.0-1`	not yet assigned	Not reported	Not reported
Cpe	libidn2	cpe	Not reported	`2.2.0`	Not reported	NVD-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.12	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.13	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.14	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.15	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.16	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.17	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.18	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.19	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.20	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.21	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.22	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.23	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Alpine	libidn2	apk	3.24	`2.2.0-r0`	Not reported	ALPINE-CVE-2019-12290	Not reported
Ubuntu	libidn2	deb	18.04	`2.0.4-1.1ubuntu0.2`	Not reported	USN-4168-1	Not reported
Ubuntu	libidn2	deb	18.04	`2.0.4-1.1ubuntu0.2`	Not reported	UBUNTU-CVE-2019-12290	Not reported
Opensuse	libidn2	rpm	leap 15.0	`2.2.0-lp150.2.3.1`	Not reported	OPENSUSE-SU-2019:2613-1	Not reported
Suse	libidn2	rpm	linux enterprise module for basesystem 15	`2.2.0-3.3.1`	Not reported	SUSE-SU-2019:3086-1	Not reported
Suse	libidn2	rpm	linux enterprise module for basesystem 15 sp1	`2.2.0-3.3.1`	Not reported	SUSE-SU-2019:3086-1	Not reported
Opensuse	libidn2	rpm	leap 15.1	`2.2.0-lp151.3.3.1`	Not reported	OPENSUSE-SU-2019:2611-1	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[idn2]Fixed
Source package: [libidn2]
Details (2)
- 2.3.3-1+b1 · amd64 · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
- 2.3.3-1+b1 · arm64 · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
[libidn2-0]Fixed
Source package: [libidn2]
Details (2)
- 2.3.3-1+b1 · amd64 · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
- 2.3.3-1+b1 · arm64 · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
[libidn2-dev]Fixed
Source package: [libidn2]
Details (2)
- 2.3.3-1+b1 · amd64 · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
- 2.3.3-1+b1 · arm64 · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
[libidn2-doc]Fixed
Source package: [libidn2]
Details (2)
- 2.3.3-1 · all · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm
- 2.3.3-1 · all · bookworm
  Fixed · Fixed: 2.2.0-1
  dsa · libidn2 · debian · bookworm

Observed: Oct 23, 2026, 5:39:30 PM UTC

References

[CISA cybersecurity advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]