# CVE-2026-125115: Novu: `validateUrlSsrf` permits CGNAT (100.64.0.0/10) destinations — affects Workflow HTTP request step + Webhook filter condition

Status: published. Published: 2026-11-09. Updated: 2026-11-09.

Novu provides an API for sending notifications through multiple channels. Prior to 3.17.0, validateUrlSsrf in libs/application-generic/src/utils/ssrf-url-validation.ts uses the isPrivateIp deny-list without covering the RFC6598 100.64.0.0/10 shared address space or its IPv4-mapped IPv6 forms. The workflow HTTP request step and webhook filter condition can therefore send server-side requests when a configured literal address or resolved hostname falls in that range. In Alibaba Cloud, 100.100.100.200 may expose instance metadata, while self-hosted and multi-tenant deployments may expose provider-internal services, private infrastructure, service meshes, or VPN resources reachable through CGNAT addressing. This issue is fixed in version 3.17.0.

## Remediation

- fix: @novu/application-generic (npm): OSV reports a fixed version 3.17.0. Check the advisory for supported release branches. (source: OSV GHSA-vg6v-j97m-h5xq) — https://github.com/advisories/GHSA-vg6v-j97m-h5xq

## Affected products and versions

- novuhq / novu: < 3.17.0 (affected). Source: CNA: GitHub_M
- @novu / application-generic: < 3.17.0 (affected). Source: CNA: GitHub_M
-  / @novu/application-generic (@novu/application-generic): ≥ 0; < 3.17.0 (affected, semver); OSV events: introduced 0; fixed 3.17.0. Source: OSV GHSA-vg6v-j97m-h5xq

## Severity and prioritization

- CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N; source: CNA: GitHub_M

- CVSS 3.1: 6.8 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-918

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/novuhq/novu/security/advisories/GHSA-vg6v-j97m-h5xq (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/novuhq/novu/pull/11197 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/novuhq/novu/releases/tag/v3.17.0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/novuhq/novu/pull/11197 (security-advisories@github.com)

- https://github.com/novuhq/novu/releases/tag/v3.17.0 (security-advisories@github.com)

- https://github.com/novuhq/novu/security/advisories/GHSA-vg6v-j97m-h5xq (security-advisories@github.com)

- https://github.com/advisories/GHSA-vg6v-j97m-h5xq (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-vg6v-j97m-h5xq (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-125115; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-125115; retrieved 2026-11-10; source updated 2026-11-09

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-vg6v-j97m-h5xq; retrieved 2026-11-09; source updated 2026-11-09

Revision: 7a7191afe91d732389731ef58891d48fc595bea33aa54e02be142c268f7b59c1

Canonical: https://y2.dev/cve/CVE-2026-125115

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