CVE-2026-49234 — routinator
HIGHCVE-2026-49234 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in routinator. A fix is available for routinator — see the affected versions and patch details below.
Routinator crashes when sending a maliciously crafted select-asn query parameter
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-49234.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
routinatorReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.
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.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🦀crates.io | routinator | all versions | 0.15.2cargo update -p routinator --precise 0.15.2 |
Affected Products
routinatornlnetlabsDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for routinator, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update routinator to 0.15.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-49234 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability is rated as having Important severity because an unauthenticated remote attacker can crash the Routinator service by sending a malformed request, resulting in a denial of service. The affected package is not shipped in Red Hat Enterprise Linux and is only packaged in Fedora and EPEL community…
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.Source: Red Hat security advisory for CVE-2026-49234 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2026-49234 in your dependencies?
Find it across crates.io, including transitive dependencies.