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  4. CVE 2026 124739 busybox httpd stack buffer overflow via an i rule
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Back to active CVEs
High · CVSS 7.5CVE-2026-124739

Busybox: httpd stack buffer overflow via an "i:" rule in a subdirectory httpd.confCVE-2026-124739

Answer in brief

CVE-2026-124739 records a High severity (CVSS 7.5) vulnerability in Busybox: httpd stack buffer overflow via an "i:" rule in a subdirectory httpd.conf. 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 Nov 11, 2026Updated Nov 11, 2026Source checked Nov 11, 2026First seen by HOL Nov 11, 2026Material review Nov 11, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
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 7.5. 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: Prevent untrusted users from creating or modifying configuration files by restricting write permissions on all web root and subdirectory paths served by BusyBox httpd to administrative accounts only: chmod -R o-w /path/to/webroot Additionally, ensure the BusyBox httpd process drops elevated privileges by specifying an unprivileged user with the `-u` flag upon execution: busybox httpd -u nobody Restarting the daemon is required for process-level flag changes to take effect, which will temporarily terminate active network connections. Caveats: Running under a non-privileged user account prevents binding directly to privileged ports (below 1024) without additional system capabilities or port forwarding, and restricting directory permissions may interfere with workflows that require unprivileged file uploads.

Evidence timeline and material changes

  1. Published upstream

    Nov 11, 2026

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

  2. Source modified

    Nov 11, 2026

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

  3. First seen by HOL

    Nov 11, 2026

Sources and claim methodology

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

A flaw was found in BusyBox. When the httpd web server processes subdirectory configuration files, an overly long index page name can trigger a stack-based buffer overflow. An attacker with permissions to write to a subdirectory configuration file could exploit this vulnerability to execute arbitrary code with elevated privileges or cause a denial of service (DoS) by crashing the server process.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Busybox: heap buffer overflow in the tftp client on fallback to the default block sizeSame red hat/busybox package
  • Busybox: httpd password rule bypass for pre-compressed .gz files via accept-encoding: gzipSame red hat/busybox package
  • Busybox: use-after-free of requested_ipv6 in udhcpc6Same red hat/busybox package
  • Busybox: stack buffer overflow in udhcpc6 send_d6_renew() and send_d6_release()Same red hat/busybox package
  • Busybox: divide-by-zero in the volume_id fat prober via a zero sectors_per_cluster valueSame red hat/busybox package
  • Busybox: divide-by-zero and heap over-read in the volume_id hfs+ proberSame red hat/busybox package

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-787
Source
CVE List V5
Source checked
Nov 11, 2026
References
2 linked sources
Open source record