# CVE-2026-1684: Free5GC SMF PFCP UDP Endpoint pfcp_reports.go HandleReports denial of service

> Remote attackers can cause a denial of service in Free5GC SMF via the PFCP UDP endpoint, requiring a patch to mitigate.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Jan 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-4v8j-92c3-9f2f

## What is CVE-2026-1684?

CVE-2026-1684 is a medium-severity denial of service vulnerability in Free5gc Free5gc, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in Free5GC SMF up to 4.1.0. Affected by this issue is the function HandleReports of the file /internal/context/pfcp_reports.go of the component PFCP UDP Endpoint. The manipulation results in denial of service. The attack can be executed remotely. It is advisable to implement a patch to correct this issue.

Weakness: CWE-404 (Improper Resource Shutdown or Release)

## Which versions are affected by CVE-2026-1684?

It affects 1 product.


Products: Free5gc Free5gc.

## How do I fix CVE-2026-1684?

No fix has been published for CVE-2026-1684 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1684 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1684 exists.

## Other vulnerabilities in Free5gc Free5gc

- [CVE-2026-44327](https://insights.sbomify.com/CVE-2026-44327/): free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler (critical 10.0)
- [CVE-2026-44329](https://insights.sbomify.com/CVE-2026-44329/): free5GC's SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers (critical 10.0)
- [CVE-2026-44330](https://insights.sbomify.com/CVE-2026-44330/): free5GC's NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions (critical 10.0)
- [CVE-2025-63679](https://insights.sbomify.com/CVE-2025-63679/): Memory corruption in n/a (critical 9.8)
- [CVE-2026-44315](https://insights.sbomify.com/CVE-2026-44315/): free5GC's NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1684 and fix it if it is affected.

What it is: CVE-2026-1684 is a medium-severity denial of service vulnerability in Free5gc Free5gc, published on 30 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-1684 exists.

Affected product: Free5gc Free5gc. 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-2026-1684/ (Markdown: https://insights.sbomify.com/CVE-2026-1684/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1684
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1684
- OSV: https://osv.dev/vulnerability/CVE-2026-1684

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1684/
Summaries are generated and may contain mistakes; the official description above is the record.