Nautobot: Webhook definitions could be used for server-side request forgery (SSRF)GHSA-c35q-vxrp-ph26
HIGHFix: nautobot/nautobot@16aa4aaGHSA-c35q-vxrp-ph26 is a high-severity (CVSS 8.5) Server-Side Request Forgery (SSRF) vulnerability in nautobot. A fix is available for nautobot — see the affected versions and patch details below.
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 GHSA-c35q-vxrp-ph26.
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
nautobot🐍nautobotReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
Nautobot's Webhook data model and associated feature set could be configured by users with sufficient access to perform requests to various hosts and IP addresses that should not be permitted, allowing for various behaviors similar to server-side request forgery (SSRF).
Patches
Fixes are available in Nautobot v2.4.33 and v3.1.2.
In support of this fix, three new settings variables have been added to Nautobot:
WEBHOOK_ALLOWED_SCHEMES- By default new or updatedWebhookrecords will be restricted to HTTP or HTTPS only, disallowing other schemes that may have been previously allowed. Administrators should audit existingWebhookrecords to identify any that are invalid, and either update/delete said records or customizeWEBHOOK_ALLOWED_SCHEMESas appropriate.WEBHOOK_ADDITIONAL_BLOCKED_NETWORKS- This can be used to specify additional IP networks that should be denied toWebhooksending, for example some deployments may wish to disallow RFC1918 addresses or even disallow all networks and carve out specific exemptions using the following setting.WEBHOOK_ALLOWED_HOSTS- This can be used to provide an allow-list of specific hosts that would otherwise be blocked by anyWEBHOOK_ADDITIONAL_BLOCKED_NETWORKSconfiguration.
Workarounds
Administrators should review which users have been granted add or change permissions for the Webhook data model, and should review currently defined Webhook records for safety and validity. Other than that, no specific workaround has been identified.
References
- 2.4.33 (<a href="https://github.com/nautobot/nautobot/commit/16aa4aa9796ab7a31c4d615ec945e1f16d8c77c4">patch</a>)
- 3.1.2 (<a href="https://github.com/nautobot/nautobot/commit/7324c8f0d8c7245fbc691e15d729adc2d2707d08">patch</a>)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | nautobot | ≥ 3.0.0a2&&< 3.1.2 | 3.1.2pip install --upgrade 'nautobot==3.1.2' |
| 🐍PyPI | nautobot | all versions | 2.4.33pip install --upgrade 'nautobot==2.4.33' |
Affected Products
nautobotnetworktocodeDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for nautobot, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update nautobot to 3.1.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c35q-vxrp-ph26 is resolved across your whole dependency graph.
Workarounds
Restrict outbound requests from the affected component to an allowlist of hosts, block access to link-local and internal address ranges at the network layer, and require authentication on internal services so a forged request cannot reach them unauthenticated.
Frequently Asked Questions
Is GHSA-c35q-vxrp-ph26 in your dependencies?
Find it across PyPI, including transitive dependencies.