CVE-2026-72755
Deferred Deferred - Pending Action

TA Certificate Cache Overwrite in Routinator

Publication date: 2026-10-26

Last updated on: 2026-10-26

Assigner: NLnet Labs

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

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Meta Information

Published
2026-10-26
Last Modified
2026-10-26
Generated
2026-10-26
AI Q&A
2026-10-26
EPSS Evaluated
N/A
NVD
CVE-2026-72755
EUVD
EUVD-2026-110028

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
nlnetlabs routinator to 0.15.2 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-755 The product does not handle or incorrectly handles an exceptional condition.

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Executive Summary

Routinator caches a newly-retrieved Trust Anchor (TA) certificate over HTTPS without validating it first. This means even if the certificate is invalid or malicious, it could overwrite a previously trusted TA certificate in the cache.

Impact Analysis

An attacker could exploit this to replace a legitimate TA certificate with a malicious one, potentially allowing them to intercept or manipulate RPKI data. This could lead to route hijacking or other network attacks.

Mitigation Strategies

Update Routinator to the latest version to ensure proper validation of TA certificates. Monitor cache files for unexpected overwrites of TA certificates. Review HTTPS traffic logs for unusual certificate retrieval patterns.

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