Bug 2439039 (CVE-2026-26157) - CVE-2026-26157 busybox: BusyBox: Arbitrary file overwrite and potential code execution via incomplete path sanitization
Summary: CVE-2026-26157 busybox: BusyBox: Arbitrary file overwrite and potential code ...
Keywords:
Status: NEW
Alias: CVE-2026-26157
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2439044 2439045 2439046
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-11 18:09 UTC by OSIDB Bzimport
Modified: 2026-02-11 20:17 UTC (History)
14 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-02-11 18:09:04 UTC 
Affects: BusyBox v1.36.1 and v1.37.0 (likely affects earlier versions too)
CVSS: 8.6 (HIGH)
Component: strip_unsafe_prefix() function in archive extraction utilities
          (tar, unzip, rpm, ar, dpkg)

Description:
Incomplete path sanitization fails to detect trailing ".." components in
filenames (e.g., "logs/data/.."), allowing files to be written outside the
intended extraction directory when the current working directory matches
the target location. An attacker can craft malicious archives that
overwrite arbitrary files within the extraction directory scope.

Impact:
Arbitrary file overwrite, potential code execution through modification of
shell configuration files, cron jobs, or other sensitive files.
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