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  4. CVE 2026 88834 busybox busybox httpd user existence oracle in
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Back to active CVEs
Low · CVSS 3.7CVE-2026-88834

Busybox: busybox: httpd user existence oracle in non-default shadow-disabled buildsCVE-2026-88834

Answer in brief

CVE-2026-88834 records a Low severity (CVSS 3.7) vulnerability in Busybox: busybox: httpd user existence oracle in non-default shadow-disabled builds. The current sources do not mark it as known exploited. The current feed maps Red Hat/busybox (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 13, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Oct 13, 2026Material review Oct 13, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 3.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/busybox (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/busyboxgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/busybox.
  2. 2Review the reported fix. Source-reported workaround: Prefer explicit username:password entries in httpd.conf instead of /:*:* system-password wildcards. Use PAM-based authentication where available. Ensure BusyBox is built with FEATURE_SHADOWPASSWDS enabled (default).

Evidence timeline and material changes

  1. Published upstream

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 13, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of serviceSame red hat/busybox package
  • Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restrictionsSame red hat/busybox package
  • odt2spip < 4.4.0 OS Command Injection via Document FilenameSame generic ecosystem
  • Docker Hub account conversion could reassign an active personal access token to another userSame generic ecosystem
  • dataclasses-avroschema allows code injection through generated field-default literalsSame generic ecosystem
  • dataclasses-avroschema allows code injection through record names in generated default factoriesSame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-203
Source
CVE List V5
Source checked
Oct 13, 2026
References
2 linked sources
Open source record