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TI-2026-12078 Aliases CVE-2026-14266GHSA-836v-xv29-x32v

Heap-based buffer overflow in 7-Zip

Priority LOW 37CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-122 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00742 54th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
7-Zip7-Zip26.01—No fix listedCNA
  • 7-Zip Vendor7-Zip Affected 26.01 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:*before 26.02Vulnerable7-Zip
  • cpe:2.3:a:7-zip:7-zip:*:*:*:*:*:*:*:* Versions before 26.02 Vulnerable ·7-Zip

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-14266
  2. 2026-10-03 Alias added: GHSA-836v-xv29-x32v

References

Advisory 2

  • TI-2025-00330 Protection mechanism failure in 7-Zip KEVCVSS 3.1HIGH 7.0
  • TI-2026-35535 GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation CVSS 3.1HIGH 8.8
  • TI-2024-10630 Integer underflow in 7-Zip CVSS 3.1HIGH 7.8
  • TI-2023-14827 Ppmd7.c in 7-Zip before 23.00 allows an integer underflow and invalid read operation via a crafted 7Z archive. CVSS 3.1HIGH 7.8
  • TI-2026-35532 7-Zip SquashFS Fragment Offset Overflow (GHSL-2026-116) CVSS 3.1HIGH 8.1
  • TI-2026-35551 GHSL-2026-121 7-Zip UEFI DEPEX OOB Read CVSS 3.1HIGH 7.1
See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences