# CVE-2026-14266: 7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability > Remote attackers can execute arbitrary code by tricking users into opening malicious XZ-compressed files in 7-Zip. - **Severity:** High 7.0 (`CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Local or same network only - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 29 Jul 2026 - **Updated:** 30 Jul 2026 - **Also known as:** DEBIAN-CVE-2026-14266, ECHO-0d1c-e83c-8090, GHSA-836v-xv29-x32v, MINI-4qhf-r3gc-9xrm, SUSE-SU-2026:23317-1, SUSE-SU-2026:3869-1, UBUNTU-CVE-2026-14266, openSUSE-SU-2026:11319-1, openSUSE-SU-2026:21641-1 ## What is CVE-2026-14266? CVE-2026-14266 is a high-severity memory corruption vulnerability in 7-Zip, published on 29 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link. ### Official 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. Weakness: CWE-122 (Heap-based Buffer Overflow) ## Which versions are affected by CVE-2026-14266? It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `7zip` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server 16.0 | All versions | 26.02-160000.1.1 | | `7zip` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 26.02-150400.9.9.1 | | `7zip` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 26.02-160000.1.1 | | `7zip` | openSUSE:Leap 16.0 | All versions | 26.02-160000.1.1 | | `7zip` | openSUSE:Tumbleweed | All versions | 26.02-1.1 | Products: 7-Zip 7-Zip. ## How do I fix CVE-2026-14266? Apply the vendor's patch. ## Is CVE-2026-14266 being exploited? There is no known exploitation of CVE-2026-14266 in the wild and no public exploit code. Public exploit code: - CVE-2026-14266 - XZ Heap Buffer Overflow PoC Generator for 7-Zip (github_poc): https://github.com/4minx/CVE-2026-14266 - 7-Zip XZ Decoder Heap Buffer Overflow - Full analysis, root cause, PoC, and RCE exploitation roadmap (github_poc): https://github.com/liyuxuan504-byte/CVE-2026-14266 - https://github.com/ret2bilibili/CVE-2026-14266 (github_poc): https://github.com/ret2bilibili/CVE-2026-14266 ## Other vulnerabilities in 7-Zip - [CVE-2025-0411](https://insights.sbomify.com/CVE-2025-0411/): 7-Zip Mark of the Web Bypass (high 7.0, exploited in the wild) - [CVE-2008-6536](https://insights.sbomify.com/CVE-2008-6536/): Other in n/a (critical 10.0) - [CVE-2026-48095](https://insights.sbomify.com/CVE-2026-48095/): GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation (high 8.8) - [CVE-2018-10172](https://insights.sbomify.com/CVE-2018-10172/): Privilege escalation in n/a (high 8.8) - [CVE-2016-2335](https://insights.sbomify.com/CVE-2016-2335/): Memory corruption in n/a (high 8.8) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-14266 and fix it if it is affected. What it is: CVE-2026-14266 is a high-severity memory corruption vulnerability in 7-Zip, published on 29 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2026-14266 in the wild and no public exploit code. Affected product: 7-Zip. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-14266/ (Markdown: https://insights.sbomify.com/CVE-2026-14266/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-14266 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-14266 - OSV: https://osv.dev/vulnerability/CVE-2026-14266 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-14266/ Summaries are generated and may contain mistakes; the official description above is the record.