---
id: CVE-2026-101955
title: >-
  A Stack-based Buffer Overflow vulnerability in the UTM Anti-Spam SBL of
  Juniper Networks Junos OS on SRX series allows an unauthenticated remote
  attacker to cause arbitrary code execution or a denial of service via a
  injected malformed D…
summary: >-
  A Stack-based Buffer Overflow vulnerability in the UTM Anti-Spam SBL of
  Juniper Networks Junos OS on SRX series allows an unauthenticated remote
  attacker to cause arbitrary code execution or a denial of service via a
  injected malformed D…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:17:48.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101955'
references:
  - url: 'https://supportportal.juniper.net/JSA112186'
    label: sirt@juniper.net
tags:
  - nvd
ingestedAt: '2026-10-14T17:44:53.631Z'
---

## Overview

A Stack-based Buffer Overflow vulnerability in the UTM Anti-Spam SBL of Juniper Networks Junos OS on SRX series allows an unauthenticated remote attacker to cause arbitrary code execution or a denial of service via a injected malformed DNS packet when Anti-Spam SBL inspection is enabled.

## Remediation

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