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Fencer Vulns
high 7.0

CVE-2026-26158 json

Busybox: busybox: arbitrary file modification and privilege escalation via unvalidated tar archive entries

published 2026-02-11 8 mo ago modified 2026-11-04 4 d ago also EUVD-2026-7020

cvss
7.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

A flaw was found in BusyBox. This vulnerability allows an attacker to modify files outside of the intended extraction directory by crafting a malicious tar archive containing unvalidated hardlink or symlink entries. If the tar archive is extracted with elevated privileges, this flaw can lead to privilege escalation, enabling an attacker to gain unauthorized access to critical system files.

Patch / fix

  • Red Hat Red Hat Hardened Images 1.37.0-7.2.hum1
  • Siemens RUGGEDCOM RST2428P V4.0
  • busybox Debian 14 1:1.37.0-10.1

debian advisories DEBIAN-CVE-2026-26158

  • busybox hummingbird 1 1.37.0-7.2.hum1
  • busybox-shared hummingbird 1 1.37.0-7.2.hum1
  • busybox-petitboot hummingbird 1 1.37.0-7.2.hum1

red hat advisories RHSA-2026:13831

  • busybox SLES for SAP applications 16.0, SLES 16.0 1.37.0-160000.5.1
  • busybox SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 1.35.0-150400.3.14.1
  • busybox SLE Module for Basesystem 15 SP7 1.37.0-150700.18.15.1
  • busybox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 1.37.0-150500.10.17.1
  • busybox-links openSUSE Leap 15.6 1.37.0-150500.7.11.1
  • busybox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.35.0-10.3.1

suse advisories SUSE-SU-2026:20905-1SUSE-SU-2026:0892-1SUSE-SU-2026:0872-1SUSE-SU-2026:0759-1SUSE-SU-2026:0758-1

  • busybox openSUSE Leap 16.0 1.37.0-160000.5.1
  • busybox openSUSE Tumbleweed 1.37.0-9.1

opensuse advisories openSUSE-SU-2026:20387-1openSUSE-SU-2026:10231-1

  • busybox CBL-Mariner 2.0 1.35.0-17
  • busybox Azure Linux 3.0 1.36.1-22

azure linux advisories AZL-77606AZL-77613

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2026-26158 updated cvss 7.0

busybox: BusyBox: Arbitrary file modification and privilege escalation via unvalidated tar archive entries

  • Red Hat Enterprise Linux 6 busybox, busybox-petitboot
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Hardened Images busybox 1.37.0-7.2.hum1, busybox-shared 1.37.0-7.2.hum1, busybox-petitboot 1.37.0-7.2.hum1
    fixed: vendor fix RHSA-2026:13831

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
8 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

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

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 6
  • Siemens RUGGEDCOM RST2428P

Classification

Weakness
  • CWE-73 External Control of File Name or Path

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.