---
id: CVE-2026-19411
title: >-
  Shim/dp.c library: null-pointer dereference in is_removable_media_path() when
  devicepathtostr() returns null
summary: >-
  A NULL pointer vulnerability has been found in the the shim application of
  dp.c library. A missing NULL pointer could allow attackers to perform a denial
  of service attack on a system that uses shim application for UEFI bootloader.
severity: low
cvss: 3.9
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-476
vendor: Red Hat
product: shim-signed
affected:
  - shim-signed (all versions)
  - shim-unsigned-aarch64 (all versions)
  - shim-unsigned-aarch64 (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-11T13:28:50.750565Z'
published: '2026-08-10'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T18:09:10.248Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-19411'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-19411'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2513060'
    label: RHBZ#2513060
tags:
  - cve.org
epss: 0.00133
epssPercentile: 0.02868
ingestedAt: '2026-11-06T19:01:36.639Z'
---

## Overview

A NULL pointer vulnerability has been found in the the shim application of dp.c library. A missing NULL pointer could allow attackers to perform a denial of service attack on a system that uses shim application for UEFI bootloader.

## Affected

- `shim-signed (all versions)`
- `shim-unsigned-aarch64 (all versions)`
- `shim-unsigned-aarch64 (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

The code could be modified to include NULL pointer checkers in the code. 
Before DevicePathToStr : "if (li == NULL || li->FilePath == NULL) return 0;"
After DevicePathToStr : "if (bootpath == NULL) return 0;"
At error: "if (bootpath != NULL)"