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Fencer Vulns
high 7.0

CVE-2026-26157 json

Busybox: busybox: arbitrary file overwrite and potential code execution via incomplete path sanitization

published 2026-02-11 8 mo ago modified 2026-11-04 4 d ago also EUVD-2026-7022

cvss
7.0
version 3.1, 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
1
Exploit-DB

Summary

A flaw was found in BusyBox. Incomplete path sanitization in its archive extraction utilities allows an attacker to craft malicious archives that when extracted, and under specific conditions, may write to files outside the intended directory. This can lead to arbitrary file overwrite, potentially enabling code execution through the modification of sensitive 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-2026-26157

  • 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 1.37.0-10.1

opensuse advisories openSUSE-SU-2026:20387-1openSUSE-SU-2026:10258-1

  • busybox CBL-Mariner 2.0 1.35.0-18
  • busybox Azure Linux 3.0 1.36.1-22

azure linux advisories AZL-77603AZL-77610

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-2026-26157 updated cvss 7.0

busybox: BusyBox: Arbitrary file overwrite and potential code execution via incomplete path sanitization

  • 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

Timeline

  1. Published
  2. First public exploit (EDB-52538)

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
8 mo ago

Exploit prediction

0.72% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-52538 BusyBox 1.37.0 - Path Traversal webapps, 2026-04-30

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.