CVE-2026-87081 Net::IDN::UTS46 - Denial of Service

Net::IDN::UTS46 < 2.590 for Perl contains a denial of service caused by quadratic punycode encoding of an overlong label before length check in to_ascii, letting attackers exhaust CPU resources, exploit requires sending crafted input with many distinct non-ASCII characters.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-407

Vendor fix

Update to version 2.590 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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