What’s Vulnerable › Vulnerabilities
CVE-2026-72757: Routinator HTTP server becomes unavailable with many unclosed connections
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-26 · updated 2026-10-26
- Weakness: CWE-755
Description
Routinator runs out of open connections on the HTTP server when many connections are opened but never closed, leaving the HTTP server unavailable. This condition can be triggered maliciously by an attacker by opening a large number of connections to the HTTP server. This only affects users that make their HTTP or RTR server available to untrusted networks.
Affected products
- NLnet Labs Routinator: all versions — fixed in 0.15.3
How to fix
Upgrade to a fixed version: NLnet Labs Routinator 0.15.3. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-72757 or the next vulnerability affects your stack