CVE-2026-19499 — Buffer overflow in strfmon and strfmon_l right-justification padding
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 …
Published: 2026-09-14 · CVSS: 7.7 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7