Medium severity · published Oct 26, 2026
CVE-2026-72757
Routinator HTTP server becomes unavailable with many unclosed connections
New
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RO
Routinator · NLnet Labs
All versions, or not specified · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-72757
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-72757
www.nlnetlabs.nl
https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72756.txt
More from Routinator
8.7
CVE-2026-49232
Routinator exits when accepting an incoming HTTP or RTR connection fails
8.2
CVE-2026-72753
Routinator incorrectly handles delta updates
7.5
CVE-2026-72758
Routinator may exit on malformed ranges
7.5
CVE-2026-72756
Routinator exits on malformed rsync URIs
7.5
CVE-2026-72754
Routinator exits when parsing an incorrect or very large CRL file