CVE-2026-125742

7-Zip before 26.06 Heap Out-of-Bounds Write via LZX Decoder in CAB Extraction

Published Nov 10, 2026 CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Description
7-Zip before 26.06 contains a heap out-of-bounds write vulnerability in the LZX decoder that lets attackers corrupt memory when a continuation CAB volume declares a smaller window. Attackers can entice victims to extract crafted multi-volume CAB archives, where a stale _pos value bypasses bounds checks, enabling arbitrary code execution.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Description 7-Zip before 26.06 contains a heap out-of-bounds write vulnerability in the LZX decoder that lets attackers corrupt memory when a continuation CAB volume declares a smaller window. Attackers can entice victims to extract crafted multi-volume CAB archives, where a stale _pos value bypasses bounds checks, enabling arbitrary code execution.
Title 7-Zip before 26.06 Heap Out-of-Bounds Write via LZX Decoder in CAB Extraction
First Time appeared 7-zip
7-zip 7-zip
Weaknesses CWE-787
CPEs cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:*
Vendors & Products 7-zip
7-zip 7-zip
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.5, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 12, 2026, 6:03 PM
Reserved
Nov 10, 2026, 11:57 AM
Status
Awaiting Analysis
Published
Nov 10, 2026, 12:17 PM
Modified
Nov 12, 2026, 7:16 PM