# CVE-2026-5745: libarchive13: A flaw was found in libarchive

CVE-2026-5745 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-5745, released April 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-5745
- Priority: Routine
- CVSS: 5.5 (Medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 7, 2026

## Description

A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, specifically within the archive_acl_from_text_nl() function. When processing a malformed ACL string (such as a bare "d" or "default" tag without subsequent fields), the function fails to perform adequate validation before advancing the pointer. An attacker can exploit this by providing a maliciously crafted archive, causing an application utilizing the libarchive API (such as bsdtar) to crash, resulting in a Denial of Service (DoS).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libarchive Debian 14 | 3.8.8-1 | [DEBIAN-CVE-2026-5745](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5745.md) | Apr 7, 2026 |
| Linux | libarchive-tools Ubuntu 20.04 LTS (focal) | 3.4.0-2ubuntu1.5+esm3 | [libarchive-tools 3.4.0-2ubuntu1.5+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libarchive-tools-3.4.0-2ubuntu1.5-esm3.md) | Jul 24, 2026 |
| Linux | libarchive-tools Ubuntu 22.04.1 LTS (jammy) | 3.6.0-1ubuntu1.8 | [libarchive-tools 3.6.0-1ubuntu1.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libarchive-tools-3.6.0-1ubuntu1.8.md) | Jul 24, 2026 |
| Linux | libarchive-tools Ubuntu 24.04.5 LTS (noble) | 3.7.2-2ubuntu0.8 | [libarchive-tools 3.7.2-2ubuntu0.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libarchive-tools-3.7.2-2ubuntu0.8.md) | Jul 24, 2026 |
| Linux | libarchive-tools Ubuntu 26.04.1 LTS (resolute) | 3.8.5-1ubuntu2.2 | [libarchive-tools 3.8.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libarchive-tools-3.8.5-1ubuntu2.2.md) | Jul 10, 2026 |
| Linux | libarchive13 Ubuntu 20.04 LTS (focal) | 3.4.0-2ubuntu1.5+esm3 | [libarchive13 3.4.0-2ubuntu1.5+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libarchive13-3.4.0-2ubuntu1.5-esm3.md) | Jul 24, 2026 |
| Linux | libarchive13 Ubuntu 22.04.1 LTS (jammy) | 3.6.0-1ubuntu1.8 | [libarchive13 3.6.0-1ubuntu1.8](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libarchive13-3.6.0-1ubuntu1.8.md) | Jul 24, 2026 |
| Linux | libarchive13t64 Ubuntu 24.04.5 LTS (noble) | 3.7.2-2ubuntu0.8 | [libarchive13t64 3.7.2-2ubuntu0.8](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libarchive13t64-3.7.2-2ubuntu0.8.md) | Jul 24, 2026 |
| Linux | libarchive13t64 Ubuntu 26.04.1 LTS (resolute) | 3.8.5-1ubuntu2.2 | [libarchive13t64 3.8.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libarchive13t64-3.8.5-1ubuntu2.2.md) | Jul 10, 2026 |

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Data as of 2026-11-08T00:53:09Z 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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