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Fencer Intel
medium 6.5

CVE-2026-37458 json

Missing input validation in the MP_REACH_NLRI component of FRRouting (FRR) stable/10.0 to stable/10.6 allows authenticated attackers to cau…

published 6mo ago modified 4mo ago also EUVD-2026-26977

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 16%
public exploits
0
none known

Summary

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.

Patch / fix

  • frr Debian 12 8.4.4-1.1~deb12u2
  • frr Debian 13 10.3-3+deb13u1
  • frr Debian 14 10.6.0-2

debian advisories DEBIAN-CVE-2026-37458

  • frr Ubuntu 22.04 LTS 8.1-1ubuntu1.16
  • frr Ubuntu 24.04 LTS 8.4.4-1.1ubuntu6.7
  • frr Ubuntu 25.10 10.4.1-3ubuntu1.4
  • frr Ubuntu 26.04 LTS 10.5.1-1ubuntu4.1

ubuntu advisories UBUNTU-CVE-2026-37458

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

  • frr SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 7.4-150300.4.43.1
  • frr SLE Module for Server Applications 15 SP7 10.2.6-150700.3.10.1
  • frr SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES 15 SP6-LTSS +4 more 8.5.7-150500.4.43.1
  • frr SLES for SAP applications 16.0, SLES 16.0 10.2.6-160000.1.1
  • quagga SLES LTSS Extended Security 12 SP5 1.1.1-17.16.1
  • frr SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 8.5.7-8.16.1

suse advisories SUSE-SU-2026:3868-1SUSE-SU-2026:2644-1SUSE-SU-2026:2457-1SUSE-SU-2026:2455-1SUSE-SU-2026:2454-1SUSE-SU-2026:22026-1

  • frr openSUSE Tumbleweed 10.6.1-1.1

opensuse advisories openSUSE-SU-2026:10721-1

  • frr Azure Linux 3.0 10.5.4-1

azure linux advisories AZL-86214

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

Is CVE-2026-37458 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-37458 updated cvss 6.5

frr: denial of service via crafted UPDATE message

  • Red Hat Enterprise Linux 8 frr, frr-contrib, frr-selinux
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 9 frr, frr10, frr-selinux, frr10-selinux
    affected: workaround, no fix available, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 10 frr
    affected: workaround, no fix planned “Out of support scope”

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
no
Technical impact
partial
Assessed
6mo ago

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel 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.