# CVE-2026-93345: MikroTik RouterOS < 7.25beta4 Improper Input Validation DoS via BGP Labelled-VPN NLRI

> An unauthenticated attacker can crash the BGP service on MikroTik RouterOS by sending malformed BGP UPDATE messages, causing a denial of service.

- **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:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Sep 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-r8vv-pch2-7g9j

## What is CVE-2026-93345?

CVE-2026-93345 is a high-severity denial of service vulnerability in MikroTik RouterOS, published on 22 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLRI iterators of the routing service that allows an unauthenticated on-path attacker to crash the BGP service by sending a malformed MP_REACH_NLRI UPDATE message with a prefix-length value below the minimum valid for a labelled-VPN NLRI, which passes validation while describing a route with a negative-length address portion. Attackers can repeatedly send a single BGP UPDATE packet carrying a VPNv4 or VPNv6 NLRI with an out-of-bounds prefix-length to indefinitely hold down the BGP plane, causing session termination without a NOTIFICATION and triggering a service malfunction on the device. The fix is carried only in 7.25beta4, a development build; the current stable release 7.24.2 and the current long-term release 7.23.5 both remain affected.

Weakness: CWE-1284 (Improper Validation of Specified Quantity in Input)

## Which versions are affected by CVE-2026-93345?


## How do I fix CVE-2026-93345?

No fix has been published for CVE-2026-93345 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93345 being exploited?

There is no known exploitation of CVE-2026-93345 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93345 and fix it if it is affected.

What it is: CVE-2026-93345 is a high-severity denial of service vulnerability in MikroTik RouterOS, published on 22 Sep 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-2026-93345 in the wild and no public exploit code.

Affected product: MikroTik RouterOS. 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-2026-93345/ (Markdown: https://insights.sbomify.com/CVE-2026-93345/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93345
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93345
- OSV: https://osv.dev/vulnerability/CVE-2026-93345

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93345/
Summaries are generated and may contain mistakes; the official description above is the record.