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  4. CVE 2026 124740 busybox use after free of requestedipv6 in udhcpc6
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Back to active CVEs
Medium · CVSS 4.3CVE-2026-124740

Busybox: use-after-free of requested_ipv6 in udhcpc6CVE-2026-124740

Answer in brief

CVE-2026-124740 records a Medium severity (CVSS 4.3) vulnerability in Busybox: use-after-free of requested_ipv6 in udhcpc6. 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
Medium · CVSS 4.3
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 4.3. 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: 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.

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's udhcpc6 DHCPv6 client. A malicious server on the local network can trigger a use-after-free condition by responding with a crafted Dynamic Host Configuration Protocol for IPv6 (DHCPv6) reply packet lacking usable address options. This issue causes the client to read stale heap memory, which can result in a Denial of Service (DoS) due to an application crash or disclose previously assigned network address data in subsequent discovery requests.

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: httpd stack buffer overflow via an "i:" rule in a subdirectory httpd.confSame 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-416
Source
CVE List V5
Source checked
Nov 11, 2026
References
2 linked sources
Open source record