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High severity7.7NVD Advisory· Published Sep 14, 2026· Updated Sep 18, 2026

CVE-2026-19499

CVE-2026-19499

Description

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.

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Affected products

229

Patches

Vulnerability mechanics

References

1

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CVE-2026-19499 · High · VYPR