TI-2026-80510 Aliases CVE-2026-72755 GHSA-gh5x-9h83-m96f

Routinator stores unvalidated TA certificate in cache

LOW 17CWE-755Published 2026-10-26 · Updated 2026-10-26

Key facts

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

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

Summary

NLnet Labs Routinator stores a newly retrieved trust anchor certificate, fetched over HTTPS, in its cache without validating it. Even when validation fails, the new certificate can overwrite a known good trust anchor certificate, an improper handling of exceptional conditions (CWE-755). A remote attacker with high privileges can affect integrity and availability, with limited impact.

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

Description from the CNA

Routinator stores a newly-retrieved TA certificate via HTTPS in cache without validation, potentially overwriting a known good TA certificate even if validation fails.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00184 8th percentileScored 2026-11-07

Fix Fixed Routinator (NLnet Labs): 0.15.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
NLnet Labs	Routinator	—	0.15.3	Patch available	CNA

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.

CPE	Versions	Role	Vendor
cpe:2.3:a:nlnetlabs:routinator::::::::	—	—	NLNETLABS

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

Remediation

Upgrade Routinator to version 0.15.3, which fixes this flaw.

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

Fix · CNA Routinator (NLnet Labs) Fixed in 0.15.3

Timeline

2026-10-26 Threatist record created from CVE-2026-72755
2026-10-26 CISA SSVC decision points changed
2026-10-27 Alias added: GHSA-gh5x-9h83-m96f

References

Advisory 1

https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72755.txt

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