---
id: CVE-2026-95508
title: >-
  A heap-based buffer overflow was found in the DHCPv6 and TFTP response
  builders of libslirp
summary: >-
  A heap-based buffer overflow was found in the DHCPv6 and TFTP response
  builders of libslirp. When the host is configured with a small interface MTU,
  a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow
  the reply bu…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-787
vendor: Red Hat
product: libslirp
affected:
  - libslirp (all versions)
  - 'container-tools:rhel8/libslirp (all versions)'
  - libslirp (all versions)
  - libslirp (all versions)
  - openshift/ose-rhel-coreos-8 (all versions)
  - openshift/ose-rhel-coreos-9 (all versions)
published: '2026-09-22'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T19:37:36.747'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95508'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-95508'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2537748'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-95508.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-95508'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-95508'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.0057
epssPercentile: 0.44777
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-22T16:13:20.788433Z'
ingestedAt: '2026-09-22T09:01:05.606Z'
---

## Overview

A heap-based buffer overflow was found in the DHCPv6 and TFTP response builders of libslirp. When the host is configured with a small interface MTU, a guest-supplied DHCPv6 CLIENTID option or TFTP blksize option can overflow the reply buffer with attacker-controlled content and length, resulting in denial of service and potentially arbitrary code execution in the host process. The default interface MTU is not affected.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-22 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-95508.json)