CVE-2016-15059
CVSS v3
9.8
CRITICAL
EPSS Score
0.4 %
exploit probability, as of 2026-09-28
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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
Technical details
- Published
- 2026-09-22
- Last Modified
- 2026-09-22
Frequently asked questions
What is CVE-2016-15059?
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
Is CVE-2016-15059 actively exploited?
Active exploitation of CVE-2016-15059 has not been confirmed. Its EPSS score was 0.4% on 2026-09-28, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2016-15059?
CVE-2016-15059 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2016-15059 affecting your environment?
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