CVE-2019-12290
HIGH7.5EPSS 1.6%Published: 10/22/2019Modified: 4/28/2026
Also known as:ALPINE-CVE-2019-12290DEBIAN-CVE-2019-12290
Description
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.
Affected packages (2)
- Alpine/libidn2from 0, < 2.2.0-r0
- Debian/libidn2from 0, < 2.2.0-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |