---
id: CVE-2026-101303
title: >-
  The IPv6 UDP send path for unconnected sockets did not apply the jail policy
  of rewriting a loopback destination address to the jail's primary IPv6
  address.


  A process in a classic (non-VNET) jail can send UDP datagrams to services
  liste…
summary: >-
  The IPv6 UDP send path for unconnected sockets did not apply the jail policy
  of rewriting a loopback destination address to the jail's primary IPv6
  address.


  A process in a classic (non-VNET) jail can send UDP datagrams to services
  liste…
severity: none
cwe:
  - CWE-941
vendor: FreeBSD
product: FreeBSD
affected:
  - FreeBSD >= 15.1-RELEASE < p4
  - FreeBSD >= 15.0-RELEASE < p14
  - FreeBSD >= 14.5-RELEASE < p1
  - FreeBSD >= 14.4-RELEASE < p10
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T07:17:57.437'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101303'
references:
  - url: 'https://security.freebsd.org/advisories/FreeBSD-SA-26:69.udp.asc'
    label: secteam@freebsd.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-15T07:57:27.842Z'
---

## Overview

The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address.

A process in a classic (non-VNET) jail can send UDP datagrams to services listening on the host's IPv6 loopback address, bypassing jail network isolation.

## Remediation

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