CVE-2023-25139: GNU Glibc

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

sprintf in the GNU C Library (glibc) 2.37 has a buffer overflow (out-of-bounds write) in some situations with a correct buffer size. This is unrelated to CWE-676. It may write beyond the bounds of the destination buffer when attempting to write a padded, thousands-separated string representation of a number, if the buffer is allocated the exact size required to represent that number as a string. For example, 1,234,567 (with padding to 13) overflows by two bytes.

Affected products

• GNU Glibc: version 2.37 only

Published 2023-02-03. Last modified 2026-06-17.