---
id: "CVE-2026-103390"
kind: "vulnerability"
aliases: ["CVE-2026-103390"]
title: "Juniper Session Smart Router: HTTP parser flaw lets a crafted request crash it"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "juniper", "network-appliance", "session-smart-conductor", "session-smart-router"]
not_affected_if: ["unknown"]
published_at: "2026-10-28T17:17:21+00:00"
first_seen_at: "2026-10-28T17:34:08+00:00"
updated_at: "2026-10-28T17:34:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103390", "first_seen_at": "2026-10-28T17:34:08+00:00"}]
---

# Juniper Session Smart Router: HTTP parser flaw lets a crafted request crash it

The HttpParser component in Juniper Session Smart Router and Session Smart Conductor reads memory outside its bounds when handling a specially crafted HTTP request. An attacker can use this to cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Timeline

- 2026-10-28T17:34:08+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-103390

## From the sources

An Out-of-Bounds Read vulnerability in the HttpParser component in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker to cause a denial of service via a specially crafted HTTP request.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_