What is CVE-2026-37458?

CVE-2026-37458 is a medium-severity vulnerability in Frrouting, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-05-04.

How severe is CVE-2026-37458?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Frrouting

CVE-2026-37458

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-05-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (35.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 35.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

Frrouting

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

github.com/FRRouting/frr/commit/8102a8aeceb9f86fdfe1f80cd77080522bab69c8 (Patch)
github.com/mertsatilmaz/vulnerability-research/blob/main/advisories/CVE-2026-36… (Third Party Advisory)

Frequently asked questions

What is CVE-2026-37458?: CVE-2026-37458 is a medium-severity vulnerability in Frrouting, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-05-04.
How severe is CVE-2026-37458?: Medium severity. CVSS v3 base score is 6.5 out of 10.