CVE-2023-25139 Memory corruption in n/a

Critical 9.8 Published 3 Feb 2023 Updated 14 Oct 2026

A buffer overflow in glibc sprintf allows attackers to write beyond bounds when formatting padded numbers, potentially leading to code execution or crashes.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2023-25139?

CVE-2023-25139 is a critical memory corruption vulnerability in Gnu Glibc, published on 3 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-787

Which versions are affected by CVE-2023-25139?

It affects 1 product.

Linux distribution packages (1)

glibc openSUSE:Tumbleweed All versions 2.38-1.1

Products include Gnu Glibc.

How do I fix CVE-2023-25139?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-25139 being exploited?

There is no known exploitation of CVE-2023-25139 in the wild and no public exploit code.

All Gnu Glibc vulnerabilities

Sources

Also known as ALPINE-CVE-2023-25139, BELL-CVE-2023-25139, CLEANSTART-2023-PY66778, GHSA-2g67-jw5m-244m, openSUSE-SU-2024:13123-1.