CVE-2026-37457: High severity Frrouting FRR vulnerability

Published May 1, 2026
·
Updated

An off-by-one out-of-bounds write vulnerability in the bgpflowspecopdecode() function (bgpd/bgpflowspecutil.c) of FRRouting (FRR) stable/10.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted FlowSpec component.

Affected Software

17 affected componentsFixes available
Frrouting FRR=stable/10.0
Microsoft azl3 frr 10.5.0-3
Patch available
Frrouting FRRouting=10.0
Microsoft azl3 frr 10.5.4-1<10.5.4-1
10.5.4-1
Microsoft azl3 frr 10.5.0-3<10.5.4-1
10.5.4-1
ubuntu/quagga*
ubuntu/quagga*
ubuntu/quagga*
ubuntu/frr*
ubuntu/frr<8.1-1ubuntu1.16
8.1-1ubuntu1.16
ubuntu/frr<8.4.4-1.1ubuntu6.7
8.4.4-1.1ubuntu6.7
ubuntu/frr<10.4.1-3ubuntu1.4
10.4.1-3ubuntu1.4
ubuntu/frr<10.5.1-1ubuntu4.1
10.5.1-1ubuntu4.1
debian/frr
8.4.4-1.1~deb12u210.3-3+deb13u110.7.1-7
debian/frr<8.4.4-1.1~deb12u2
8.4.4-1.1~deb12u2
debian/frr<10.3-3+deb13u1
10.3-3+deb13u1
debian/frr<10.6.0-2
10.6.0-2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.5.4-1
  2. Upgrade

    Upgrade ubuntu/frr to a version that resolves this vulnerability.

    Fixed in 8.1-1ubuntu1.16
  3. Upgrade

    Upgrade ubuntu/frr to a version that resolves this vulnerability.

    Fixed in 8.4.4-1.1ubuntu6.7
  4. Upgrade

    Upgrade ubuntu/frr to a version that resolves this vulnerability.

    Fixed in 10.4.1-3ubuntu1.4
  5. Upgrade

    Upgrade ubuntu/frr to a version that resolves this vulnerability.

    Fixed in 10.5.1-1ubuntu4.1
  6. Upgrade

    Upgrade debian/frr to a version that resolves this vulnerability.

    Fixed in 8.4.4-1.1~deb12u2Fixed in 10.3-3+deb13u1Fixed in 10.7.1-7
  7. Upgrade

    Upgrade debian/frr to a version that resolves this vulnerability.

    Fixed in 8.4.4-1.1~deb12u2
  8. Upgrade

    Upgrade debian/frr to a version that resolves this vulnerability.

    Fixed in 10.3-3+deb13u1
  9. Upgrade

    Upgrade debian/frr to a version that resolves this vulnerability.

    Fixed in 10.6.0-2

Event History

May 1, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Data Sourced
via OSV·12:00 AM
DescriptionSeverity
Data Sourced
via Red Hat·06:01 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·06:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
May 5, 2026
Data Sourced
via Microsoft·08:03 AM
DescriptionSeverityWeaknessAffected Software
Nov 5, 2026
Data Sourced
via OSV·07:03 PM
Affected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-37457?

CVE-2026-37457 is classified as a Denial of Service vulnerability.

2

How do I fix CVE-2026-37457?

To fix CVE-2026-37457, upgrade to the latest version of FRRouting that addresses this vulnerability.

3

Which versions of FRRouting are affected by CVE-2026-37457?

CVE-2026-37457 affects only the stable/10.0 version of FRRouting.

4

Can CVE-2026-37457 be exploited remotely?

Yes, CVE-2026-37457 can be exploited remotely by supplying a crafted FlowSpec component.

5

What impact does CVE-2026-37457 have on systems?

The impact of CVE-2026-37457 is a potential Denial of Service, which can disrupt the availability of affected systems.

Company

Resources

Contact

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