CVE-2026-87081
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
Net::IDN::UTS46 versions before 2.590 for Perl allow CPU exhaustion via quadratic punycode encoding of overlong labels before the length check in to_ascii. Labels with many distinct non-ASCII characters cause quadratic CPU cost. All ASCII conversions in the distribution are affected.
Risk Assessment
An attacker can send a long label to exhaust CPU, causing slowdown or denial of service in domain name processing services.
Recommendation
Update Net::IDN::UTS46 to version 2.590 or later. Consider limiting label length before conversion.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

