Cloudanix VulnDB

CVE-2026-19499

High · 7.7

CVSS

7.7

EPSS

0.3%

Published

Sep 14, 2026

CISA due date

—

The record

Calling strfmon and strfmon_l in the GNU C Library version 2.38 to 2.44 can write past the end of the caller-supplied output buffer when a conversion uses right-justified width padding. Exploitation requires an application code path that calls strfmon or strfmon_l with right-justified width padding into a destination buffer that is large enough for the padding to succeed but too small for the internal memmove call. The field width or format may be attacker-influenced or a fixed susceptible pattern in the caller. At the time of publication, no network-facing application impact is known.

Affected packages

Ecosystem Package Introduced Fixed

Related vulnerabilities