@novu/application-generic: validateUrlSsrf permits CGNAT (100.64.0.0/10) destinations — affects Workflow HTTP request step + Webhook filter condition

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Hi Novu team, Reporting an SSRF blocklist gap in the shared validateUrlSsrf guard. A complete self-contained reproduction is inlined below — copy the four files into a directory and run docker compose up, plus a single-file probe that runs against Node directly. Locally validated against HEAD 291817c. Summary Novu's shared SSRF guard validateUrlSsrf(url) is used before server-side requests to user-configured URLs. The guard resolves hostnames and blocks a regex list of private/reserved IP ranges, but it does not block 100.64.0.0/10 shared address space. As a result, Novu features protected by this guard can still send server-side requests to destinations such as 100.100.100.200 (Alibaba Cloud metadata service) and any other service reachable in 100.64.0.0/10. Affected code Guard: - libs/application-generic/src/utils/ssrf-url-validation.ts - isPrivateIp(...) regex list at lines 9-28 - DNS resolution and address validation at lines 55-72 Product call-sites: - Workflow HTTP request…

Published by the source

28 Jul 2026, 14:59 UTC

Last modified by the source

28 Jul 2026, 14:59 UTC

Source last checked

26 Oct 2026, 13:00 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-vg6v-j97m-h5xq

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# Patch Next advisory brief: GHSA-vg6v-j97m-h5xq

Advisory: @novu/application-generic: `validateUrlSsrf` permits CGNAT (100.64.0.0/10) destinations — affects Workflow HTTP request step + Webhook filter condition
IDs: GHSA-vg6v-j97m-h5xq
Record: https://patchnext.com/advisories/ghsa-vg6v-j97m-h5xq (revision 1, source checked 26 Oct 2026, 13:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @novu/application-generic 3.17.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @novu/application-generic: affected < 3.17.0; fixed in 3.17.0

## Suggested inspection (read-only)
- `npm ls @novu/application-generic --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @novu/application-generic.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vg6v-j97m-h5xq (GitHub-reviewed advisory GHSA-vg6v-j97m-h5xq lists affected ranges: npm @novu/application-generic >=0 <3.17.0)

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