Medium 5.3Published Oct 26, 2026

CVE-2026-72757Routinator HTTP server becomes unavailable with many unclosed connections

Updated under an hour ago (Oct 29, 2026, 1:50 PM ET)

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It affects NLnet Labs Routinator. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-755
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: NLnet Labs
NVD analysis: Deferred
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 26, 2026

Affected products

Affected products

NLnet Labs Routinator nlnet_labs:routinator (from the name)	from 0.15.3 not affected	CNA record

References

References

https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72756.txt	vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.