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Vulnerability record

CVE-2026-125742

highCVSS 4.0 8.5Published · 7-Zip

The short answer

CVE-2026-125742 affects 7-Zip 7-Zip and is rated high (CVSS 8.5). It is not in CISA's Known Exploited Vulnerabilities catalog.

What it is

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.

Weakness: CWE-787.

Severity

8.5 high

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploited (CISA KEV)

Not listed

CISA lists confirmed exploitation only

EPSS, next 30 days

No score

FIRST scores CVEs within a day of publication

How it can be exploited

Attack vector
Local
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
Passive
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Affected products

7-Zip. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-125742 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-10.

How do I fix CVE-2026-125742?

Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Awaiting Analysis. The description is NVD's text, quoted as published.

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