---
id: CVE-2026-115207
title: >-
  Patch: filename validation bypass in reversal fallback allows file creation
  outside the working directory
summary: >-
  A flaw was found in GNU patch. An attacker can achieve arbitrary file creation
  outside the intended working directory by enticing a user or automated
  workflow to apply a specially crafted patch file. Due to missing validation
  during auto…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-22
vendor: Red Hat
product: patch
affected:
  - patch (all versions)
  - patch
  - patch (all versions)
  - patch (all versions)
  - patch (all versions)
  - patch (all versions)
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T10:16:12.930Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115207'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-115207'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2558775'
    label: RHBZ#2558775
tags:
  - cve.org
ingestedAt: '2026-10-22T10:35:54.917Z'
---

## Overview

A flaw was found in GNU patch. An attacker can achieve arbitrary file creation outside the intended working directory by enticing a user or automated workflow to apply a specially crafted patch file. Due to missing validation during automatic patch reversal, absolute file paths in patch headers are accepted rather than rejected. Consequently, the utility can create files in arbitrary locations with the permissions of the executing user.

## Affected

- `patch (all versions)`
- `patch`
- `patch (all versions)`
- `patch (all versions)`
- `patch (all versions)`
- `patch (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.