---
title: "CVE-2026-19499: GNU C Library - Buffer Overflow"
description: "GNU C Library 2.38 to 2.44 contains a buffer overflow caused by strfmon and strfmon_l functions writing past the end of the output buffer with right-justified width padding, letting attackers cause memory corruption, exploit requires specific application code paths with vulnerable buffer sizes."
url: https://panop.io/threat-heartbeat/CVE-2026-19499/
---

# CVE-2026-19499 GNU C Library - Buffer Overflow

GNU C Library 2.38 to 2.44 contains a buffer overflow caused by strfmon and strfmon\_l functions writing past the end of the output buffer with right-justified width padding, letting attackers cause memory corruption, exploit requires specific application code paths with vulnerable buffer sizes.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.30% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19499)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-122](https://cwe.mitre.org/data/definitions/122.html)

## Vendor fix

Update to a version later than 2.44 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-19499](https://nvd.nist.gov/vuln/detail/CVE-2026-19499)
- [https://sourceware.org/bugzilla/show\_bug.cgi?id=34510](https://sourceware.org/bugzilla/show_bug.cgi?id=34510)
- [https://sourceware.org/git/?p=glibc.git;a=blob\_plain;f=advisories/GLIBC-SA-2026-0017](https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0017)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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