Heap-based buffer overflow in 7-Zip - CVE-2026-14266

Vulnerability identifier: #VU138425

CSH Severity: High

CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-14266

CWE-ID: CWE-122

Exploitation vector: Remote access

Exploit availability: Public exploit is available

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the processing of XZ chunked data. A remote attacker can trick a victim to open a specially crafted file, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

7-Zip
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
Basesystem Module
openSUSE Leap
7zip

Install updates from vendor's website.

7-Zip - update to 26.02
7zip - update to 26.02-150400.9.9.1

• Exploit #12899 - CVE-2026-14266 (7-Zip XZ Decoder Heap Buffer Overflow - Full analysis, root cause, PoC, and RCE exploitation roadmap) (August 14, 2026)

• https://www.zerodayinitiative.com/advisories/ZDI-26-444/

• Remote code execution in 7-Zip
• SUSE update for 7zip