---
id: CVE-2026-88373
title: >-
  libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in
  the NAL parsing path
summary: >-
  libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in
  the NAL parsing path. When de265_push_NAL() is called with a zero-length NAL
  unit, the resulting NAL_unit may retain a NULL backing buffer, which is
  subsequentl…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
published: '2026-09-24'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:17:31.937'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88373'
references:
  - url: >-
      https://github.com/strukturag/libde265/commit/f8d324914e43d92af23614f22959cf9eee7bf9ea
    label: cve@mitre.org
  - url: 'https://github.com/strukturag/libde265/issues/534'
    label: cve@mitre.org
  - url: 'https://github.com/strukturag/libde265/issues/534'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-25T17:24:11.917709Z'
ingestedAt: '2026-09-24T16:47:15.850Z'
epss: 0.00155
epssPercentile: 0.03939
---

## Overview

libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in the NAL parsing path. When de265_push_NAL() is called with a zero-length NAL unit, the resulting NAL_unit may retain a NULL backing buffer, which is subsequently passed as the destination argument to memcpy() in NAL_unit::set_data(). Although the copy length is zero, this violates the nonnull requirement of memcpy() and results in undefined behavior, causing process termination in UBSan-instrumented builds and denial of service.

## Remediation

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