CVE-2026-14266

EUVD-2026-50420

29.07.2026, 18:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7 HIGH	LOCAL	HIGH	NONE	CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Debian Releases

Debian Product

Codename

7zip

bookworm	vulnerable
forky	26.02+dfsg-2 fixed
sid	26.02+dfsg-2 fixed
trixie	vulnerable

p7zip

bookworm	postponed
bullseye	postponed
bullseye (security)	vulnerable
trixie	16.02+transitional.1 fixed

Common Weakness Enumeration

CWE-122 - Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

References

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

http://www.openwall.com/lists/oss-security/2026/07/17/12