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CVE-2026-49234 NLnet Labs CVE debrief

CVE-2026-49234 is a HIGH severity vulnerability in Routinator that causes a crash when a specifically crafted non-UTF-8 string is sent as a select-asn query parameter to the /api/v1/origins endpoint. This issue only affects users who allow API access from untrusted networks. The vulnerability was published on [cvePublishedAt] and modified on [cveModifiedAt].

Vendor
NLnet Labs
Product
Routinator
CVSS
HIGH 8.2
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Users of Routinator who allow API access from untrusted networks should be aware of this vulnerability and take steps to mitigate it.

Technical summary

When sending a specifically crafted non-UTF-8 string as select-asn query parameter to the /api/v1/origins endpoint, Routinator crashes.

Defensive priority

HIGH

Recommended defensive actions

  • Users should update to a version of Routinator that is not vulnerable.
  • Users should restrict API access to trusted networks only.

Evidence notes

The vulnerability has a CVSS score of 8.2 and is considered HIGH severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49234 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49234

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-49234 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49234

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.