# CVE-2026-14266: p7zip: 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability

CVE-2026-14266 is fixed in 10 products on 1 platform, first by DEBIAN-CVE-2026-14266, released July 18, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-14266
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0074
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 29, 2026

## Description

7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.  The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | 7zip Debian 12.15 (bookworm) | 22.01+really26.02+dfsg-0+deb12u1 | [DEBIAN-CVE-2026-14266](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14266.md) | Jul 18, 2026 |
| Linux | 7zip Debian 14 | 26.02+dfsg-1 | [DEBIAN-CVE-2026-14266](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14266.md) | Jul 18, 2026 |
| Linux | 7zip amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip opensuse-leap 16.0 | 26.02-160000.1.1 | [OPENSUSE-SU-2026:21641-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21641-1.md) | Aug 25, 2026 |
| Linux | 7zip sles 15.6 | 26.02-150400.9.9.1 | [SUSE-SU-2026:3869-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3869-1.md) | Aug 28, 2026 |
| Linux | 7zip sles 15.7 | 26.02-150400.9.9.1 | [SUSE-SU-2026:3869-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3869-1.md) | Aug 28, 2026 |
| Linux | 7zip sles 16.0 | 26.02-160000.1.1 | [SUSE-SU-2026:23317-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23317-1.md) | Aug 25, 2026 |
| Linux | 7zip-debuginfo amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-debugsource amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-reduced amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-reduced-debuginfo amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-standalone amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-standalone-all amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-standalone-all-debuginfo amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | 7zip-standalone-debuginfo amzn 2023 | 26.02-17.amzn2023.0.1 | [ALAS2023-2026-2037](https://patchblox.com/security/data/fix/linux/alas2023-2026-2037.md) | Aug 3, 2026 |
| Linux | p7zip Debian 12.15 (bookworm) | 16.02+really26.02+dfsg-0+deb12u1 | [DEBIAN-CVE-2026-14266](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14266.md) | Jul 18, 2026 |
| Linux | p7zip Debian 13.5 (trixie) | 16.02+transitional.1 | [DEBIAN-CVE-2026-14266](https://patchblox.com/security/data/fix/linux/debian-cve-2026-14266.md) | Jul 18, 2026 |

---

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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.