https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Thu, 01 Oct 2026 03:27:24 +0000 https://vulnerability.circl.lu/vuln/fkie_cve-2026-87081 <p>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.</p> <p>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.</p> <p>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.</p> <p>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.</p> https://vulnerability.circl.lu/vuln/fkie_cve-2026-87081 https://vulnerability.circl.lu/vuln/ghsa-653x-rhrr-h9h8 <p>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.</p> <p>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.</p> <p>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.</p> <p>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.</p> https://vulnerability.circl.lu/vuln/ghsa-653x-rhrr-h9h8 https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-87081 <p><strong>Affected:</strong> Ubuntu:16.04:LTS: libnet-idn-encode-perl, Ubuntu:18.04:LTS: libnet-idn-encode-perl, Ubuntu:20.04:LTS: libnet-idn-encode-perl, Ubuntu:22.04:LTS: libnet-idn-encode-perl, Ubuntu:24.04:LTS: libnet-idn-encode-perl, Ubuntu:26.04:LTS: libnet-idn-encode-perl</p> <p>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.</p> <p><strong>Affected:</strong> Ubuntu:16.04:LTS: libnet-idn-encode-perl, Ubuntu:18.04:LTS: libnet-idn-encode-perl, Ubuntu:20.04:LTS: libnet-idn-encode-perl, Ubuntu:22.04:LTS: libnet-idn-encode-perl, Ubuntu:24.04:LTS: libnet-idn-encode-perl, Ubuntu:26.04:LTS: libnet-idn-encode-perl</p> <p>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.</p> https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-87081