# CVE-2026-101968: Integer overflow in Junos OS

> An unauthenticated adjacent attacker can cause heap memory disclosure and multicast join-state injection via malformed Rosen-MVPN messages on specific Juniper platforms.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/AU:Y/R:A/V:C/RE:M`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 16 Oct 2026
- **Also known as:** GHSA-7prh-2254-fh5w

## What is CVE-2026-101968?

CVE-2026-101968 is a medium-severity vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An Integer Underflow (Wrap or Wraparound) vulnerability in the rpd process of Juniper Networks Junos OS on EX Series and MX Series, and Junos OS Evolved on ACX Series allows an unauthenticated adjacent attacker to cause heap memory disclosure and multicast join-state injection via a malformed Rosen-MVPN message.

This issue only affects platforms that support draft Rosen MVPN, such as the ACX Series, EX Series, and MX Series.

Weakness: CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2026-101968?


## How do I fix CVE-2026-101968?

No fix has been published for CVE-2026-101968 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-101968 being exploited?

There is no known exploitation of CVE-2026-101968 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101968 and fix it if it is affected.

What it is: CVE-2026-101968 is a medium-severity vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-101968 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-2026-101968/ (Markdown: https://insights.sbomify.com/CVE-2026-101968/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101968
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101968
- OSV: https://osv.dev/vulnerability/CVE-2026-101968

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-101968/
Summaries are generated and may contain mistakes; the official description above is the record.