CVE-2025-31177: gnuplot Heap-based Buffer Overflow

Vulnerability summary

CVE-2025-31177 is a medium (CVSS 5.5) Heap-based Buffer Overflow vulnerability in gnuplot. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.2% of scored vulnerabilities.

Timeline

1. 07-05-2025
   PublishedVulnerability first disclosed.
2. 25-06-2026
   Last modifiedVulnerability information updated.

Description

gnuplot is affected by a heap buffer overflow at function utf8_copy_one.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().