CVE-2026-87080 Net::IDN::Punycode - Logic Error

Net::IDN::Punycode::PP before 2.590 for Perl contains a logic error in decode_punycode caused by improper handling of truncated labels in the pure-Perl decoder, letting attackers cause inconsistent name resolution, exploit requires crafted punycode labels.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.39% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Logic Error
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-1286

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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