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TI-2026-80512 Aliases CVE-2026-72757GHSA-qfwm-769m-74fg

Routinator HTTP server becomes unavailable with many unclosed connections

Priority LOW 30CWE-755Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

NLnet Labs Routinator runs out of open connections on its HTTP server when many connections are opened and never closed, which makes the HTTP server unavailable. An unauthenticated remote attacker can trigger this by opening a large number of connections to the HTTP server, and the flaw only matters if the HTTP or RTR server is reachable from untrusted networks. The weakness is classified as CWE-755.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00359 29th percentileScored 2026-11-07
Fix Fixed Routinator (NLnet Labs): 0.15.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NLnet LabsRoutinator—0.15.3Patch availableCNA
  • Routinator VendorNLnet Labs Affected — Fixed in 0.15.3 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:*——NLNETLABS
  • cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:* Versions — — ·NLNETLABS

Remediation

Upgrade Routinator to version 0.15.3 or later, which is listed as the fixed version for this product.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

  • Fix · CNA Routinator (NLnet Labs) Fixed in 0.15.3

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    NLnet Labs Routinator — nlnetlabs.nl/downloads/routinator/CVE-2026-72756.txt

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-80513 Malformed AS range makes Routinator run out of memoryPriority LOW 39
    • TI-2026-80511 Routinator exits on malformed rsync URIsPriority LOW 39
    Show all 3 records → Advisory →

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-72757
  2. 2026-10-26 CISA SSVC decision points changed
  3. 2026-10-27 Alias added: GHSA-qfwm-769m-74fg

References

Advisory 1

  • TI-2026-25690 Possible arbitrary code execution during DNSSEC validation CVSS 4.0CRITICAL 9.1
  • TI-2026-56302 Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY CVSS 4.0CRITICAL 9.1
  • TI-2026-31146 Crash during DNSSEC validation of malicious content CVSS 4.0HIGH 8.7
  • TI-2026-31135 Heap overflow with multiple NSID, COOKIE, PADDING EDNS options CVSS 4.0HIGH 8.7
  • TI-2026-36436 Routinator crashes on specifically crafted RRDP XML files CVSS 4.0HIGH 8.7
  • TI-2026-36433 Routinator exits when accepting an incoming HTTP or RTR connection fails CVSS 4.0HIGH 8.7
See all 96 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences