CVE-2026-87079 Net::IDN::Punycode - Denial of Service

Net::IDN::Punycode < 2.590 for Perl contains a CPU exhaustion vulnerability caused by quadratic insertion cost in decode_punycode when decoding long labels, letting attackers cause denial of service, exploit requires attacker to supply long labels.

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

Upgrade 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

← All CVEs