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CVE-2026-87078

Net-IDN-Encode · Vulnerability

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-87078

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87078

Published

Net-IDN-Encode

https://cpan.org/modules

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "collectionURL": "https://cpan.org/modules",
                    "defaultStatus": "unaffected",
                    "modules": [
                        "Net::IDN::Punycode"
                    ],
                    "packageName": "Net-IDN-Encode",
                    "packageURL": "pkg:cpan/Net-IDN-Encode",
                    "programFiles": [
                        "lib/Net/IDN/Punycode.xs"
                    ],
                    "programRoutines": [
                        {
                            "name": "Net::IDN::Punycode::decode_punycode"
                        }
                    ],
                    "repo": "https://github.com/robrwo/Net-IDN-Encode",
                    "versions": [
                        {
                            "lessThan": "2.590",
                            "status": "affected",
                            "version": "2.302",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON