What is CVE-2026-14266?

CVE-2026-14266 is a high-severity vulnerability in 7-zip, classified under Heap-based Buffer Overflow. CVSS score: 7.0/10. Published 2026-07-29.

How severe is CVE-2026-14266?

High severity. CVSS v3 base score is 7.0 out of 10.

Is CVE-2026-14266 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in 7-zip

CVE-2026-14266

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 vu…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.0 (High). Vector: CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

7-zip — versions 26.01

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

Public proof-of-concept exploits

References

zdi-disclosures@trendmicro.com (x_research-advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2026-14266?: CVE-2026-14266 is a high-severity vulnerability in 7-zip, classified under Heap-based Buffer Overflow. CVSS score: 7.0/10. Published 2026-07-29.
How severe is CVE-2026-14266?: High severity. CVSS v3 base score is 7.0 out of 10.
Is CVE-2026-14266 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.