VULNERABILITY INTELLIGENCE
CVE-2016-15059
CVSS score9.8 CRITICAL
EPSS probability0.42%
CISA KEVNot currently listed
Published2026-09-22
Last modified2026-09-22
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Description
Net::IDN::Punycode versions before 2.301 for Perl allow a heap buffer overflow via unchecked writes past the output buffer in encode_punycode. The XS backend builds the encoded label in the string buffer of the scalar it returns, sized from the input length. The loop that emits the digits of each code point checks for room before every write, but the write of the last digit of each round and the write of the terminating NUL do not, so an input whose encoded form fills the buffer writes past its end. Only the XS backend is affected. Encoding an attacker-supplied string corrupts the heap.
Weakness classification
- CWE-122: Heap-based Buffer Overflow