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Fencer Vulns
high 7.5

CVE-2026-37459 json

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 craf…

published 2026-05-04 6 mo ago modified 2026-07-15 3 mo ago also EUVD-2026-27047

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:10.4.4-1.el10_2
  • Red Hat Red Hat Enterprise Linux 9 0:10.4.3-3.el9_8
  • frr Debian 14 10.6.0-2

debian advisories DEBIAN-CVE-2026-37459

  • frr Ubuntu 25.10 10.4.1-3ubuntu1.4
  • frr Ubuntu 26.04 LTS 10.5.1-1ubuntu4.1

ubuntu advisories UBUNTU-CVE-2026-37459

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • frr10 RHEL 9 10.4.3-3.el9_8
  • frr10-selinux RHEL 9 10.4.3-3.el9_8
  • frr RHEL 10.2 10.4.4-1.el10_2
  • frr-selinux RHEL 10.2 10.4.4-1.el10_2

red hat advisories RHSA-2026:24370RHSA-2026:24347

  • frr openSUSE Tumbleweed 10.6.1-1.1

opensuse advisories openSUSE-SU-2026:10721-1

  • frr AlmaLinux 10 10.4.4-1.el10_2
  • frr-selinux AlmaLinux 10 10.4.4-1.el10_2
  • frr10 AlmaLinux 9 10.4.3-3.el9_8
  • frr10-selinux AlmaLinux 9 10.4.3-3.el9_8

almalinux advisories ALSA-2026:24347ALSA-2026:24370

  • frr Rocky Linux 10 10.4.4-1.el10_2
  • frr10 Rocky Linux 9 10.4.3-3.el9_8

rocky linux advisories RLSA-2026:24347RLSA-2026:24370

  • frr Azure Linux 3.0 10.5.4-1

azure linux advisories AZL-86217

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-37459 updated cvss 7.5

frr: denial of service via crafted BGP UPDATE message

  • Red Hat Enterprise Linux 8 frr, frr-contrib, frr-selinux Red Hat Enterprise Linux 9 frr, frr-selinux
    affected: workaround, no fix planned “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.”
  • Red Hat Enterprise Linux AppStream (v. 9) frr10 10.4.3-3.el9_8, frr10-selinux 10.4.3-3.el9_8
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:24370
  • Red Hat Enterprise Linux AppStream (v. 10) frr 10.4.4-1.el10_2, frr-selinux 10.4.4-1.el10_2
    fixed: vendor fix “Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.” RHSA-2026:24347

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
6 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 8

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption
  • CWE-191 Integer Underflow (Wrap or Wraparound)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.