CVE catalog

CVE-2026-88833

A flaw was found in BusyBox's udhcpc DHCP client. When…

A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Oct 13, 2026, 1:49:21 PM UTC
Updated: Oct 13, 2026, 5:17:48 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.19% · Oct 27, 2026

Projects and upstream resources

[busybox][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "busybox",
      "status": "vulnerable",
      "release": "sid",
      "version": "1:1.38.0-3"
    },
    {
      "name": "busybox",
      "status": "vulnerable",
      "release": "forky",
      "version": "1:1.38.0-3"
    },
    {
      "name": "busybox",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1:1.37.0-6"
    },
    {
      "name": "busybox",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1:1.35.0-4+deb12u1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1150942,
      "name": "busybox",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1150942,
      "name": "busybox",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1150942,
      "name": "busybox",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1150942,
      "name": "busybox",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": []
}

[Debian bug #1150942]

Publisher notes

[trixie] busybox: Minor issue

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[busybox]Unknown
Source package: [busybox]
Details (2)
- 1:1.35.0-4+deb12u1+b1 · amd64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- 1:1.35.0-4+deb12u1+b1 · arm64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
[busybox-static]Unknown
Source package: [busybox]
Details (2)
- 1:1.35.0-4+deb12u1+b1 · amd64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- 1:1.35.0-4+deb12u1+b1 · arm64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
[busybox-syslogd]Unknown
Source package: [busybox]
Details (2)
- 1:1.35.0-4+deb12u1 · all · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- 1:1.35.0-4+deb12u1 · all · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
[udhcpc]Unknown
Source package: [busybox]
Details (2)
- 1:1.35.0-4+deb12u1+b1 · amd64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- 1:1.35.0-4+deb12u1+b1 · arm64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
[udhcpd]Unknown
Source package: [busybox]
Details (2)
- 1:1.35.0-4+deb12u1+b1 · amd64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12
- 1:1.35.0-4+deb12u1+b1 · arm64 · bookworm
  Affected
  nvd · busybox · debian · bookworm; nvd · busybox · debian · 12

[Debian 13 (Trixie)]

[busybox]Unknown
Source package: [busybox]
Details (2)
- 1:1.37.0-6+b8 · amd64 · trixie
  Affected
  nvd · busybox · debian · 13
- 1:1.37.0-6+b8 · arm64 · trixie
  Affected
  nvd · busybox · debian · 13
[busybox-static]Unknown
Source package: [busybox]
Details (2)
- 1:1.37.0-6+b8 · amd64 · trixie
  Affected
  nvd · busybox · debian · 13
- 1:1.37.0-6+b8 · arm64 · trixie
  Affected
  nvd · busybox · debian · 13
[busybox-syslogd]Unknown
Source package: [busybox]
Details (2)
- 1:1.37.0-6 · all · trixie
  Affected
  nvd · busybox · debian · 13
- 1:1.37.0-6 · all · trixie
  Affected
  nvd · busybox · debian · 13
[udhcpc]Unknown
Source package: [busybox]
Details (2)
- 1:1.37.0-6 · all · trixie
  Affected
  nvd · busybox · debian · 13
- 1:1.37.0-6 · all · trixie
  Affected
  nvd · busybox · debian · 13
[udhcpd]Unknown
Source package: [busybox]
Details (2)
- 1:1.37.0-6 · all · trixie
  Affected
  nvd · busybox · debian · 13
- 1:1.37.0-6 · all · trixie
  Affected
  nvd · busybox · debian · 13

Observed: Oct 24, 2026, 7:49:05 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]