CVE-2026-37458 Denial of service in n/a

Medium 6.5 Published 4 May 2026 Updated 5 May 2026

Authenticated attackers can cause a Denial of Service in FRRouting by sending a crafted UPDATE message due to missing input validation in MP_REACH_NLRI.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-37458?

CVE-2026-37458 is a medium-severity denial of service vulnerability in n/a, published on 4 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Missing input validation in the MP_REACH_NLRI component of FRRouting (FRR) stable/10.0 to stable/10.6 allows authenticated attackers to cause a Denial of Service (DoS) via supplying a crafted UPDATE message.

Weakness: CWE-20

Which versions are affected by CVE-2026-37458?

It affects 1 product.

Linux distribution packages (1)

quagga SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 All versions 1.1.1-17.16.1

Products include Frrouting Frrouting.

How do I fix CVE-2026-37458?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-37458 being exploited?

There is no known exploitation of CVE-2026-37458 in the wild and no public exploit code.

Sources

Also known as AZL-86214, DEBIAN-CVE-2026-37458, GHSA-m357-6hwr-7w53, SUSE-SU-2026:3868-1, UBUNTU-CVE-2026-37458.