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Vulnerability · Published Jul 29, 2026 · Assigned by zdi

CVE-2026-142667-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability

High 7.0

In plain English

A high-severity heap buffer overflow in 7-Zip from 7-Zip. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.0)7.0High
Exploit odds (30 days)0.7%top 45.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:127zip22.01+really26.02+dfsg-0+deb12u1DEBIAN-CVE-2026-14266
Debian:137zipno fix listedDEBIAN-CVE-2026-14266
Debian:147zip26.02+dfsg-1DEBIAN-CVE-2026-14266
Debian:12p7zip16.02+really26.02+dfsg-0+deb12u1DEBIAN-CVE-2026-14266
Debian:13p7zip16.02+transitional.1DEBIAN-CVE-2026-14266
Ubuntu:26.04:LTS7zipno fix listedUBUNTU-CVE-2026-14266
Ubuntu:26.107zipno fix listedUBUNTU-CVE-2026-14266
Ubuntu:22.04:LTSp7zipno fix listedUBUNTU-CVE-2026-14266

Affected products (as reported)

VendorProductVersions
7-Zip 7-Zip 26.01

Weakness: CWE-122 · Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References