CVE-2026-87082
- Source
- https://cve.org/CVERecord?id=CVE-2026-87082
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-87082.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-87082
- Downstream
- Related
- Published
- 2026-09-22T07:25:37Z
- Modified
- 2026-11-07T17:27:11Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode
- Details
-
Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode.
Neither backend checks that its input is well-formed UTF-8, so a string with the UTF-8 flag set over malformed bytes, as the :utf8 PerlIO layer produces from any malformed input, reaches the encoder unchecked. On perl 5.32 and later the XS backend reports a malformed sequence with a length of
(STRLEN)-1, so the scan steps back one byte instead of forward and never ends. On earlier perls the XS returns a valid label for a different name. The pure-Perl backend runs a regex over the flagged string. Depending on the bytes, it aborts with SIGBUS on perl 5.28 and later, dies with a panic, or returns a wrong label.The documented conversion functions match the label against Unicode properties first and that match dies on such a string, so only a direct call to encode_punycode reaches the defect. The decoder is not affected.
A direct caller encoding attacker-supplied bytes hangs, crashes or gets a label for a name the input never held.
- Database specific
{ "cna_assigner": "CPANSec", "cwe_ids": [ "CWE-1286", "CWE-835" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87082.json" }- References
-
- http://www.openwall.com/lists/oss-security/2026/09/22/17
- https://cpan.org/modules
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87082.json
- https://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/changes
- https://nvd.nist.gov/vuln/detail/CVE-2026-87082
- https://github.com/robrwo/Net-IDN-Encode/commit/0918fb4a951ed5f4494c4cf202419c2842507ea4.patch
- https://github.com/robrwo/Net-IDN-Encode/commit/572af0183b3a6294e22c6b509268da09697cf77d.patch
- https://github.com/robrwo/Net-IDN-Encode/commit/59dc7f2c605a897bcbfe0ac5eb2b8dbe6792348d.patch
- https://github.com/robrwo/Net-IDN-Encode/commit/accb6df57ad107ec0c4bfb27b21551eed97c700e.patch
- https://github.com/robrwo/Net-IDN-Encode
Affected packages
Git / github.com/robrwo/net-idn-encode
Affected ranges
- Type
- GIT
- Repo
- https://github.com/robrwo/net-idn-encode
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "2.590" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "range": [ { "fixed": "0918fb4a951ed5f4494c4cf202419c2842507ea4" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "59dc7f2c605a897bcbfe0ac5eb2b8dbe6792348d" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "accb6df57ad107ec0c4bfb27b21551eed97c700e" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "572af0183b3a6294e22c6b509268da09697cf77d" } ], "source": "REFERENCES_COMMIT" } ] }