High severity · published May 4, 2026
CVE-2026-37459
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
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-37459
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-37459
github.com
https://github.com/FRRouting/frr/commit/693a2e02687cdc9d16501275e05136edea9650d9
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:24347
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:24370
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-37459
bugzilla.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2466513
security.access.redhat.com
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-37459.json
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