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Fencer Vulns
high 7.0

CVE-2026-14266 json

7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability

published 2026-07-29 3 mo ago modified 2026-08-07 3 mo ago also EUVD-2026-50420

cvss
7.0
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

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.

Patch / fix

  • 7-zip 7-zip 26.02
  • 7zip Debian 12 22.01+really26.02+dfsg-0+deb12u1
  • 7zip Debian 14 26.02+dfsg-1
  • p7zip Debian 12 16.02+really26.02+dfsg-0+deb12u1
  • p7zip Debian 13 16.02+transitional.1

debian advisories DEBIAN-CVE-2026-14266

  • 7zip SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 26.02-150400.9.9.1
  • 7zip SLES for SAP applications 16.0, SLES 16.0 26.02-160000.1.1

suse advisories SUSE-SU-2026:3869-1SUSE-SU-2026:23317-1

  • 7zip openSUSE Leap 16.0 26.02-160000.1.1
  • 7zip openSUSE Tumbleweed 26.02-1.1

opensuse advisories openSUSE-SU-2026:21641-1openSUSE-SU-2026:11319-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-14266 updated cvss 7.0

7-Zip: 7-Zip: Remote Code Execution via XZ decompression heap-based buffer overflow

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.0 CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • 7-Zip 7-Zip

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.