# CVE-2026-19499

## Summary

- **CVE ID:** CVE-2026-19499
- **Severity:** HIGH
- **CVSS Score:** 7.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H)
- **CWE:** CWE-122
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## 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.

## Affected Products

- The GNU C Library — glibc (2.38)

## References

- [CNA](https://sourceware.org/bugzilla/show_bug.cgi?id=34510)
- [CNA](https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0017)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._