CyberRota Analysis
AI-GeneratedThe XS backend of Net::IDN::Punycode versions prior to 2.590 for Perl is vulnerable to a buffer leak that occurs when invalid labels are processed in the decode_punycode function. This flaw can lead to significant memory bloat, as each rejected label allocation doubles the buffer size without being released, potentially exhausting system resources. Organizations using affected versions should prioritize patching this vulnerability to mitigate the risk of denial-of-service conditions due to excessive memory consumption.
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 from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode. The XS backend allocates the scalar it returns before it validates the input, sizing the buffer at twice the input length. The scalar is released only on the success path, so each of the three croaks that reject a label leaves the scalar and its buffer allocated. Nothing bounds the label length in the to-Unicode direction, since the 63-byte DNS limit is checked only when converting to ASCII. Only the XS backend is affected. A sender who supplies invalid labels grows the process by twice the label length per rejected call, with no successful call needed.