Upstream information

CVE-2026-48095 at MITRE

Description

7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 << (BlockSizeLog + CompressionUnit), and a crafted image with ClusterSizeLog >= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86/x64 so _inBuf is allocated as 1 byte. ReadStream_FALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching "NTFS " at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 8.8 7.8
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network Local
Attack Complexity Low Low
Privileges Required None None
User Interaction Required Required
Scope Unchanged Unchanged
Confidentiality Impact High High
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1267421 [NEW]

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References
openSUSE Tumbleweed
  • 7zip >= 26.01-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-10942

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Module for Basesystem 15 SP7
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP7
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Desktop 15 SP7
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise High Performance Computing 15 SP7
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP4-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP4-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP5-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP5-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP6-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server 15 SP6-LTSS
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP4
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP5
  • 7zip >= 26.01-150400.9.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • 7zip >= 26.01-150400.9.6.1

Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 7zip In progress
SUSE Linux Enterprise High Performance Computing 15 SP7 7zip In progress
SUSE Linux Enterprise Module for Basesystem 15 SP7 7zip In progress
SUSE Linux Enterprise Server 15 SP7 7zip In progress
SUSE Linux Enterprise Server 16.0 7zip In progress
SUSE Linux Enterprise Server 16.1 7zip Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 7zip In progress
SUSE Linux Enterprise Server for SAP applications 16.0 7zip In progress
SUSE Linux Enterprise Server for SAP applications 16.1 7zip Affected
openSUSE Leap 16.0 7zip Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS 7zip In progress
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS 7zip In progress
SUSE Linux Enterprise Server 15 SP4-LTSS 7zip In progress
SUSE Linux Enterprise Server 15 SP5-LTSS 7zip In progress
SUSE Linux Enterprise Server 15 SP6-LTSS 7zip In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP6 7zip In progress
Products past their end of life and not receiving proactive updates anymore.
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS 7zip In progress
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS 7zip In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP4 7zip In progress
SUSE Linux Enterprise Server for SAP Applications 15 SP5 7zip In progress
openSUSE Leap 15.6 7zip Affected

SUSE Timeline for this CVE

CVE page created: Wed Jun 3 08:09:52 2026
CVE page last modified: Wed Jun 17 11:33:39 2026