CVE-2019-12290
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.
Published Oct 22, 2019 · updated Oct 14, 2026 · gnu libidn2
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.
Code
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Timeline
Detection, updates, and resolution for this record.
Oct 22, 2019 · NIST NVD
Detected
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 Unicod
Oct 14, 2026 · NIST NVD
Updated
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 Unicod
Affected
- cpe gnu/libidn2version unspecified
Sources
- CVE.orgVulnerability recordCVE-2019-12290
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2019-12290
30-day exploitation probability 3.2%
first.org - NIST NVDVulnerability recordCVE-2019-12290
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 ex
nvd.nist.gov