High severity · published Jun 8, 2026
CVE-2026-49234
Routinator crashes on specifically crafted ASN strings in the API
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
When sending a specifically crafted non-UTF-8 string as select-asn query parameter to the /api/v1/origins endpoint, Routinator crashes.
This only affects users who allow API access from untrusted networks.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RO
Routinator · Nlnetlabs
before 0.15.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49234
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49234
Vendor Advisory
https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-49234.txt
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