CVE-2026-74766 Net::IDN::Punycode - Use After Free

Net::IDN::Punycode 2.301 before 2.590 for Perl contains a use-after-free caused by improper buffer reallocation in decode_punycode, letting attackers read and write freed heap memory during punycode decoding, exploit requires attacker-supplied input.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-416

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

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