CVE-2026-26157

Arbitrary file overwrite via trailing path component

Published Feb 11, 2026 · Updated Feb 11, 2026

Path traversal in BusyBox 1.36.1 and 1.37.0 allows attackers to overwrite files by extracting a crafted archive. The strip_unsafe_prefix() function fails to reject a trailing .. path component, so archive utilities resolve writes outside the intended directory. Exploitation requires a crafted archive to be extracted while the working directory matches the target; overwritten sensitive files enable code execution.

CVSS severity7.0
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in BusyBox 1.36.1 and 1.37.0 allows attackers to overwrite files by extracting a crafted archive. The strip_unsafe_prefix() function fails to reject a trailing .. path component, so archive utilities resolve writes outside the intended directory. Exploitation requires a crafted archive to be extracted while the working directory matches the target; overwritten sensitive files enable code execution.

The record

CVE
CVE-2026-26157
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-73, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0Red Hat, Inc.CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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