# CVE-2026-102036: Junos OS and Junos OS Evolved: An EVPN default-gateway route burst causes l2ald denial of service

> A remote attacker can cause a denial of service in the l2ald process by sending crafted EVPN routes, affecting Juniper network devices.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/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-5f45-xmp9-v5g9

## What is CVE-2026-102036?

CVE-2026-102036 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

An Integer Overflow or Wraparound vulnerability in the l2ald process of Juniper Networks Junos OS and Junos OS Evolved allows a configured EVPN BGP peer to cause a denial of service via EVPN Type-2 MAC/IP routes.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2026-102036?


## How do I fix CVE-2026-102036?

No fix has been published for CVE-2026-102036 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-102036 being exploited?

There is no known exploitation of CVE-2026-102036 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-102036 and fix it if it is affected.

What it is: CVE-2026-102036 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-2026-102036 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-2026-102036/ (Markdown: https://insights.sbomify.com/CVE-2026-102036/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-102036
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-102036
- OSV: https://osv.dev/vulnerability/CVE-2026-102036

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-102036/
Summaries are generated and may contain mistakes; the official description above is the record.