# CVE-2026-125115: Novu SSRF in HTTP requests and webhooks via RFC6598 addresses

Source: https://junglewise.ai/threats/cve-2026-125115-novu-provides-an-api-for-sending-notifications-through-multiple  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-09. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-125115 · Severity: medium · CVSS 6.8 · Published 2026-11-09

Novu is a notification service that allows workflows to send HTTP requests and filter webhooks. The service failed to block requests to the RFC6598 shared address space (100.64.0.0/10), which includes cloud metadata endpoints like Alibaba Cloud's 100.100.100.200. An attacker could configure a workflow or webhook filter to access sensitive internal metadata services, potentially exposing cloud provider credentials or private infrastructure.

Technologies: [Novu](https://junglewise.ai/threats/technologies/novu). Vendors: [Novu](https://junglewise.ai/threats/vendors/novu).

## Quick answers

**Is CVE-2026-125115 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-125115 being exploited in the wild.

**How severe is CVE-2026-125115?** Medium severity, with a CVSS score of 6.8, published 9 November 2026.

**Which products and versions are affected?** Novu before 3.17.0.

**Is there a fix for CVE-2026-125115?** Yes: fixed in 3.17.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-125115 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-125115?** Check whether you run Novu at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.17.0

## Technical details

The validateUrlSsrf function in the SSRF validation module used an incomplete deny-list that omitted the RFC6598 shared address space (100.64.0.0/10) and its IPv4-mapped IPv6 equivalents. This allowed HTTP workflow steps and webhook filter conditions to make server-side requests to addresses in that range, including cloud metadata endpoints and CGNAT-routed internal services. The fix adds regex patterns to block 100.64.0.0/10 and ::ffff: IPv4-mapped forms in both the shared and application-generic implementations.

## Affected products

- Novu Novu before 3.17.0

## Timeline

- 2026-11-09: disclosed
- 2026-05-21: patched

## References

- [https://github.com/novuhq/novu/pull/11197](https://github.com/novuhq/novu/pull/11197)
- [https://github.com/novuhq/novu/releases/tag/v3.17.0](https://github.com/novuhq/novu/releases/tag/v3.17.0)

## Related threats

- [Novu access control bypass in integration mutations](https://junglewise.ai/threats/cve-2026-75517-novu-provides-an-api-for-sending-notifications-through-multiple)
- [Novu improper webhook URL validation in chat providers](https://junglewise.ai/threats/cve-2026-75511-novu-provides-an-api-for-sending-notifications-through-multiple)
- [Novu stored XSS in In-App Inbox via javascript: scheme in redirect URL](https://junglewise.ai/threats/cve-2026-75510-novu-stored-xss-in-in-app-inbox-via-javascript-scheme-in-redirect)