---
id: CVE-2026-102474
title: A flaw was found in dash
summary: >-
  A flaw was found in dash. The printf builtin reserves four bytes before
  converting a Unicode \u or \U escape, but the multi-byte token can need five
  or six bytes. A local user who can supply such an escape to dash printf or
  echo %b, incl…
severity: medium
cvss: 4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-787
vendor: Red Hat
product: dash
affected:
  - dash
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T10:17:10.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102474'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-102474'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2543004'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T09:30:49.084Z'
---

## Overview

A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write one or two bytes past that reservation.

## Remediation

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