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CVE-2026-19953 is an IDNA hostname processing flaw in perl-URI. The issue is addressed by applying Unicode NFC normalization in the URI::_idna nameprep logic so that IDNA host encoding aligns with other clients. In vulnerable versions, the lack of proper normalization can cause the library to emit a non-standard, non-round-tripping A-label during hostname encoding. This can result in inconsistent canonicalization and incorrect handling of internationalized domain names by applications that rely on perl-URI for URI or hostname processing.
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A vulnerability identified as CVE-2026-19953 affecting Fedora, with perl-uri referenced in the affected CPE/package context.
A vulnerability in perl-URI's IDNA host encoding handling where missing Unicode NFC normalization in URI::_idna nameprep could cause non-standard, non-round-tripping A-label output.
A vulnerability in perl-URI's IDNA host encoding handling where missing Unicode NFC normalization in URI::_idna nameprep could cause non-standard, non-round-tripping A-label output.
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