# CVE-2026-88373: libde265-0: libde265 commit 4d45a6b contains a NULL pointer dereference vulnerability in the NAL parsing path

CVE-2026-88373 is fixed in 3 products on 1 platform, first by libde265-0 1.0.16-1ubuntu0.1~esm2, released September 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-88373
- Priority: High
- CVSS: 7.5 (Medium)
- EPSS: 0.0042
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 24, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libde265 Debian 14 | 1.1.2-1 | [DEBIAN-CVE-2026-88373](https://patchblox.com/security/data/fix/linux/debian-cve-2026-88373.md) | Sep 25, 2026 |
| Linux | libde265-0 Ubuntu 18.04.6 LTS (bionic) | 1.0.2-2ubuntu0.18.04.1~esm7 | [libde265-0 1.0.2-2ubuntu0.18.04.1~esm7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libde265-0-1.0.2-2ubuntu0.18.04.1-esm7.md) | Oct 12, 2026 |
| Linux | libde265-0 Ubuntu 20.04 LTS (focal) | 1.0.4-1ubuntu0.4+esm3 | [libde265-0 1.0.4-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libde265-0-1.0.4-1ubuntu0.4-esm3.md) | Oct 12, 2026 |
| Linux | libde265-0 Ubuntu 22.04.1 LTS (jammy) | 1.0.8-1ubuntu0.3+esm3 | [libde265-0 1.0.8-1ubuntu0.3+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libde265-0-1.0.8-1ubuntu0.3-esm3.md) | Oct 12, 2026 |
| Linux | libde265-0 Ubuntu 24.04.5 LTS (noble) | 1.0.15-1ubuntu0.2 | [libde265-0 1.0.15-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libde265-0-1.0.15-1ubuntu0.2.md) | Oct 12, 2026 |
| Linux | libde265-0 Ubuntu 26.04.1 LTS (resolute) | 1.0.16-1ubuntu0.1~esm2 | [libde265-0 1.0.16-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libde265-0-1.0.16-1ubuntu0.1-esm2.md) | Sep 24, 2026 |
| Linux | libde265-examples Ubuntu 18.04.6 LTS (bionic) | 1.0.2-2ubuntu0.18.04.1~esm7 | [libde265-examples 1.0.2-2ubuntu0.18.04.1~esm7](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libde265-examples-1.0.2-2ubuntu0.18.04.1-esm7.md) | Oct 12, 2026 |
| Linux | libde265-examples Ubuntu 20.04 LTS (focal) | 1.0.4-1ubuntu0.4+esm3 | [libde265-examples 1.0.4-1ubuntu0.4+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libde265-examples-1.0.4-1ubuntu0.4-esm3.md) | Oct 12, 2026 |
| Linux | libde265-examples Ubuntu 22.04.1 LTS (jammy) | 1.0.8-1ubuntu0.3+esm3 | [libde265-examples 1.0.8-1ubuntu0.3+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libde265-examples-1.0.8-1ubuntu0.3-esm3.md) | Oct 12, 2026 |
| Linux | libde265-examples Ubuntu 24.04.5 LTS (noble) | 1.0.15-1ubuntu0.2 | [libde265-examples 1.0.15-1ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libde265-examples-1.0.15-1ubuntu0.2.md) | Oct 12, 2026 |
| Linux | libde265-examples Ubuntu 26.04.1 LTS (resolute) | 1.0.16-1ubuntu0.1~esm2 | [libde265-examples 1.0.16-1ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libde265-examples-1.0.16-1ubuntu0.1-esm2.md) | Sep 24, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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