High 7.5Published May 3, 2026

CVE-2026-37459An 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.

Updated under an hour ago (Oct 26, 2026, 1:00 PM ET)

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It affects Red Hat Enterprise Linux 10. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-191
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Deferred
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:10.4.4-1.el10_2 not affected	CISA ADP

References

References

https://github.com/FRRouting/frr/commit/693a2e02687cdc9d16501275e05136edea9650d9
https://access.redhat.com/errata/RHSA-2026:24347
https://access.redhat.com/errata/RHSA-2026:24370
https://access.redhat.com/security/cve/CVE-2026-37459
https://bugzilla.redhat.com/show_bug.cgi?id=2466513
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-37459.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.