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CVE-2026-87081

Net-IDN-Encode · Vulnerability

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

Original advisory

cve-program · CVE-2026-87081

Published

Net::IDN::UTS46 versions before 2.590 for Perl allow CPU exhaustion via quadratic punycode encoding of an overlong label before the length check in to_ascii. to_ascii punycode encodes each label and only then applies the 63-byte DNS limit. encode_punycode in both backends follows the sample implementation in RFC 3492, whose outer loop runs once per distinct non-ASCII code point and scans the whole input each round, so a label of distinct non-ASCII characters costs the square of its length before the limit rejects it. Every ASCII conversion in the distribution, including domain_to_ascii and email_to_ascii, goes through to_ascii.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-87081

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::UTS46"
                    ],
                    "packageName": "Net-IDN-Encode",
                    "packageURL": "pkg:cpan/Net-IDN-Encode",
                    "programFiles": [
                        "lib/Net/IDN/UTS46.pm"
                    ],
                    "programRoutines": [
                        {
                            "name": "Net::IDN::UTS46::to_ascii"
                        },
                        {
                            "name": "Net::IDN::UTS46::uts46_to_ascii"
                        }
                    ],
                    "repo": "https://github.com/robrwo/Net-IDN-Encode",
                    "versions": [
                        {
                            "lessThan": "2.590",
                            "status": "affected",
                            "version": "0",
                            "versionType": "custom"
                        }
                    ]
                }

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