CVE-2026-37459

HIGHNVD 7.57.5—

7.5

An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

CVSS v3: 7.5
EG Score: 7.5(high)
EPSS: 16.5%
KEV: Not listed

Published

May 4, 2026

Last Modified

May 5, 2026

Advisory Details (1)

Auto-updated May 4, 2026

No patch confirmed yet.

generic

bgpd: Check if the NHC length is enough to fill TLV value + TLV header · FRRouting/frr@693a2e0 · GitHub

https://github.com/FRRouting/frr/commit/693a2e02687cdc9d16501275e05136edea9650d9

Vendor Advisories for CVE-2026-37459(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2026-37459
Microsoft Security Response Center (MSRC)
An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

Frequently asked(5)

What is CVE-2026-37459?

CVE-2026-37459 is a high vulnerability published on May 4, 2026. An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

When was CVE-2026-37459 disclosed?

CVE-2026-37459 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on May 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-37459 actively exploited?

CVE-2026-37459 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-37459?

CVE-2026-37459 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2026-37459?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-37459, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2026-37459

📅 Published

🔄 Last Modified

📋 Advisory Details (1)