# CVE-2026-102086: Junos OS: SRX Series: Multiple DNS queries processed by SecIntel and DGA in the same session cause a flowd crash

> An unauthenticated attacker can cause a Denial-of-Service on Juniper SRX devices by sending specific DNS queries that trigger a null pointer dereference in the flowd process.

- **Severity:** High 8.2 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/RE:M`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-297h-p3hx-4vq4

## What is CVE-2026-102086?

CVE-2026-102086 is a high-severity vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A NULL Pointer Dereference vulnerability in the DNS plugin of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a complete Denial-of-Service (DoS).

When multiple DNS queries are received in a single flow session, where one query matches a Security Intelligence (SecIntel) feed and another query is sent for DNS Domain Generation Algorithm (DGA) analysis, an error in processing logging of these asynchronous tasks can lead to an FPC crash. The exact timing conditions are outside an attacker's direct control.

This issue affects Junos OS on SRX Series:

  *  All versions before 23.2R2-S7.7;
  *  from 23.4 before 23.4R2-S8.13;
  *  from 24.2 before 24.2R2-S5.5;
  *  from 24.4 before 24.4R2-S4;
  *  from 25.2 before 25.2R2-S1;
  *  from 25.4 before 25.4R1-S2.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2026-102086?


## How do I fix CVE-2026-102086?

No fix has been published for CVE-2026-102086 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-102086 being exploited?

There is no known exploitation of CVE-2026-102086 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102086 and fix it if it is affected.

What it is: CVE-2026-102086 is a high-severity vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-102086 in the wild and no public exploit code.

Affected product: Juniper Networks Junos OS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-102086/ (Markdown: https://insights.sbomify.com/CVE-2026-102086/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102086
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102086
- OSV: https://osv.dev/vulnerability/CVE-2026-102086

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-102086/
Summaries are generated and may contain mistakes; the official description above is the record.