Vulnerability · Published May 4, 2026 · Assigned by mitre
CVE-2026-37458
Medium 6.5
In plain English
A medium-severity improper input validation in the frr package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 83.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | frr | 8.4.4-1.1~deb12u2 | DEBIAN-CVE-2026-37458 |
| Debian:13 | frr | 10.3-3+deb13u1 | DEBIAN-CVE-2026-37458 |
| Debian:14 | frr | 10.6.0-2 | DEBIAN-CVE-2026-37458 |
| Ubuntu:22.04:LTS | frr | 8.1-1ubuntu1.16 | UBUNTU-CVE-2026-37458 |
| Ubuntu:24.04:LTS | frr | 8.4.4-1.1ubuntu6.7 | UBUNTU-CVE-2026-37458 |
| Ubuntu:25.10 | frr | 10.4.1-3ubuntu1.4 | UBUNTU-CVE-2026-37458 |
| Ubuntu:26.04:LTS | frr | 10.5.1-1ubuntu4.1 | UBUNTU-CVE-2026-37458 |
Affected products (as reported)
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H