---
id: CVE-2026-102078
title: >-
  A Use After Free vulnerability in the packet forwarding engine (pfe) of
  Juniper Networks Junos OS on SRX Series allows an unauthenticated,
  network-based attacker to cause a Denial-of-Service (DoS).




  When web filtering for TCP traffic i…
summary: >-
  A Use After Free vulnerability in the packet forwarding engine (pfe) of
  Juniper Networks Junos OS on SRX Series allows an unauthenticated,
  network-based attacker to cause a Denial-of-Service (DoS).




  When web filtering for TCP traffic i…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-416
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:18:03.400'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102078'
references:
  - url: 'https://supportportal.juniper.net/JSA112181'
    label: sirt@juniper.net
tags:
  - nvd
ingestedAt: '2026-10-14T17:44:53.665Z'
---

## Overview

A Use After Free vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).



When web filtering for TCP traffic is configured, a high volume of DNS requests increases the likelihood of a flowd crash and restart, which leads to a complete service outage until the service has automatically recovered. This is a race condition outside the attacker's direct control.

This issue affects Junos OS on SRX Series:


  *  All versions before 23.2R2-S5;
  *  from 23.4 before 23.4R2-S6;
  *  from 24.2 before 24.2R2-S3;
  *  from 24.4 before 24.4R2-S1;
  *  from 25.2 before 25.2R1-S1, 25.2R2.

## Remediation

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