CyberRota Analysis
AI-GeneratedVersions of Net::IDN::Punycode prior to 2.590 for Perl are vulnerable to input validation issues that allow attackers to supply malformed UTF-8 strings, leading to application hangs, crashes, or incorrect label generation. This vulnerability can be exploited by any application directly invoking the encode_punycode function, making it critical for developers and system administrators using affected Perl versions to prioritize updates. Organizations relying on Perl for web applications or services that handle internationalized domain names should take immediate action to mitigate potential disruptions and security risks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode. Neither backend checks that its input is well-formed UTF-8, so a string with the UTF-8 flag set over malformed bytes, as the :utf8 PerlIO layer produces from any malformed input, reaches the encoder unchecked. On perl 5.32 and later the XS backend reports a malformed sequence with a length of `(STRLEN)-1`, so the scan steps back one byte instead of forward and never ends. On earlier perls the XS returns a valid label for a different name. The pure-Perl backend runs a regex over the flagged string. Depending on the bytes, it aborts with SIGBUS on perl 5.28 and later, dies with a panic, or returns a wrong label. The documented conversion functions match the label against Unicode properties first and that match dies on such a string, so only a direct call to encode_punycode reaches the defect. The decoder is not affected. A direct caller encoding attacker-supplied bytes hangs, crashes or gets a label for a name the input never held.