---
id: CVE-2026-88834
title: A flaw was found in BusyBox's httpd web server
summary: >-
  A flaw was found in BusyBox's httpd web server. When configured with system
  password authentication, a user existence oracle may exist in certain build
  configurations. An attacker could distinguish existing from non-existing
  usernames by…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-203
vendor: Red Hat
product: busybox
affected:
  - busybox (all versions)
published: '2026-10-13'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:33:26.290'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88834'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-88834'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2531348'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88834.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-88834'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88834'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0022
epssPercentile: 0.12376
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-13T17:16:29.520798Z'
ingestedAt: '2026-10-13T17:38:53.201Z'
---

## Overview

A flaw was found in BusyBox's httpd web server. When configured with system password authentication, a user existence oracle may exist in certain build configurations. An attacker could distinguish existing from non-existing usernames by observing authentication failure behavior. Impact is limited to username enumeration and requires non-default compile options or uncommon password file states; default BusyBox builds with shadow password support are not affected.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · updated 2026-10-13 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88834.json)