# CVE-2026-101994: Junos OS and Junos OS Evolved: Malformed MC-LAG ICCP message causes l2ald heap disclosure or crash

> An attacker controlling an MC-LAG peer can send malformed ICCP messages to disclose heap memory or crash the l2ald daemon in Junos OS.

- **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:L`)
- **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-j27m-44x5-5m2c

## What is CVE-2026-101994?

CVE-2026-101994 is a high-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 Improper Handling of Length Parameter Inconsistency vulnerability in the 

l2ald 

daemon of Juniper Networks Junos OS and Junos OS Evolved allows an attacker who can control or impersonate a configured MC-LAG ICCP peer to disclose process heap memory or cause a denial of service via a malformed ICCP message.

Weakness: CWE-130 (Improper Handling of Length Parameter Inconsistency)

## Which versions are affected by CVE-2026-101994?


## How do I fix CVE-2026-101994?

No fix has been published for CVE-2026-101994 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-101994 being exploited?

There is no known exploitation of CVE-2026-101994 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101994 and fix it if it is affected.

What it is: CVE-2026-101994 is a high-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-2026-101994 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-2026-101994/ (Markdown: https://insights.sbomify.com/CVE-2026-101994/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101994
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101994
- OSV: https://osv.dev/vulnerability/CVE-2026-101994

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-101994/
Summaries are generated and may contain mistakes; the official description above is the record.