CVE catalog

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.

[CVE catalog]

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: May 4, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.37% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	frr	sid	`10.7.1-6`	fixed
Debian	frr	forky	`10.7.1-6`	fixed
Debian	frr	trixie	`10.3-3+deb13u1`	not affected
Debian	frr	trixie-security	`10.3-3+deb13u1`	not affected
Debian	frr	bookworm	`8.4.4-1.1~deb12u2`	not affected
Debian	frr	bookworm-security	`8.4.4-1.1~deb12u2`	not affected
Cpe	frr	Not reported	`8.4.4-1.1ubuntu6.7`	fixed
Cpe	frr-doc	Not reported	`8.4.4-1.1ubuntu6.7`	fixed
Cpe	frr-pythontools	Not reported	`8.4.4-1.1ubuntu6.7`	fixed
Cpe	frr-rpki-rtrlib	Not reported	`8.4.4-1.1ubuntu6.7`	fixed
Cpe	frr-snmp	Not reported	`8.4.4-1.1ubuntu6.7`	fixed
Cpe	frr	Not reported	Not reported	not affected
Ubuntu	quagga	pro	`1.1.1-3`	vulnerable
Ubuntu	quagga	pro	`1.1.1-3ubuntu1`	vulnerable
Ubuntu	quagga	pro	`1.2.2-1`	vulnerable
Ubuntu	quagga	pro	`1.2.2-1ubuntu1`	vulnerable
Ubuntu	quagga	pro	`1.2.4-1`	vulnerable
Ubuntu	quagga	pro	`1.2.4-1ubuntu0.1~esm1`	vulnerable
Ubuntu	quagga	pro	`1.2.4-1ubuntu0.1~esm2`	vulnerable
Ubuntu	quagga	20.04	`1.2.4-4build1`	vulnerable
Ubuntu	quagga	20.04	`1.2.4-4ubuntu0.1`	vulnerable
Ubuntu	quagga	20.04	`1.2.4-4ubuntu0.4`	vulnerable
Ubuntu	quagga	20.04	`1.2.4-4ubuntu0.5`	vulnerable
Ubuntu	frr	25.10	`10.2.1-1ubuntu3`	vulnerable
Ubuntu	frr	25.10	`10.3-3ubuntu2`	vulnerable
Ubuntu	frr	25.10	`10.4.1-3ubuntu1`	vulnerable
Ubuntu	frr	25.10	`10.4.1-3ubuntu1.1`	vulnerable
Ubuntu	frr	25.10	`10.4.1-3ubuntu1.2`	vulnerable
Ubuntu	frr	25.10	`10.4.1-3ubuntu1.3`	vulnerable
Ubuntu	frr	25.10	`10.4.1-3ubuntu1.4`	fixed
Ubuntu	frr	26.04	`10.4.1-3ubuntu1`	vulnerable
Ubuntu	frr	26.04	`10.4.1-3ubuntu2`	vulnerable
Ubuntu	frr	26.04	`10.5.1-1ubuntu1`	vulnerable
Ubuntu	frr	26.04	`10.5.1-1ubuntu2`	vulnerable
Ubuntu	frr	26.04	`10.5.1-1ubuntu3`	vulnerable
Ubuntu	frr	26.04	`10.5.1-1ubuntu4`	vulnerable
Ubuntu	frr	26.04	`10.5.1-1ubuntu4.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	frr	source	sid	`10.6.0-2`	not yet assigned	Not reported	Not reported
Debian	frr	source	forky	`10.6.0-2`	not yet assigned	Not reported	Not reported
Debian	frr	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	frr	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	frr	cpe	Not reported	`8.4.4-1.1ubuntu6.7`	Not reported	Not reported	Not reported
Cpe	frr-doc	cpe	Not reported	`8.4.4-1.1ubuntu6.7`	Not reported	Not reported	Not reported
Cpe	frr-pythontools	cpe	Not reported	`8.4.4-1.1ubuntu6.7`	Not reported	Not reported	Not reported
Cpe	frr-rpki-rtrlib	cpe	Not reported	`8.4.4-1.1ubuntu6.7`	Not reported	Not reported	Not reported
Cpe	frr-snmp	cpe	Not reported	`8.4.4-1.1ubuntu6.7`	Not reported	Not reported	Not reported
Ubuntu	frr	deb	25.10	`10.4.1-3ubuntu1.4`	Not reported	UBUNTU-CVE-2026-37459	Not reported
Ubuntu	frr	deb	26.04	`10.5.1-1ubuntu4.1`	Not reported	UBUNTU-CVE-2026-37459	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[frr]Not affected
Details (4)
- 8.4.4-1.1~deb12u2 · amd64 · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · arm64 · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · amd64 · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · arm64 · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
[frr-doc]Not affected
Source package: [frr]
Details (4)
- 8.4.4-1.1~deb12u2 · all · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · all · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · all · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · all · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
[frr-pythontools]Not affected
Source package: [frr]
Details (4)
- 8.4.4-1.1~deb12u2 · all · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · all · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · all · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · all · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
[frr-rpki-rtrlib]Not affected
Source package: [frr]
Details (4)
- 8.4.4-1.1~deb12u2 · amd64 · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · arm64 · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · amd64 · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · arm64 · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
[frr-snmp]Not affected
Source package: [frr]
Details (4)
- 8.4.4-1.1~deb12u2 · amd64 · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · arm64 · bookworm
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · amd64 · bookworm-security
  Not affected
  nvd · frr · debian · bookworm
- 8.4.4-1.1~deb12u2 · arm64 · bookworm-security
  Not affected
  nvd · frr · debian · bookworm

Observed: Oct 27, 2026, 7:53:20 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]