CVE WatchSep 14, 2026

CVE-2026-19499

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 c

CVSS

7.7

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 14, 2026 · Last modified: Sep 14, 2026 · CWE-122

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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