ngx-bootstrap Security: What to Know After the 2025 npm Compromise

ngx-bootstrap is a legitimate and widely used Angular component library, but in September 2025 malicious versions were published to npm, so the safe answer is to use it only with pinned, verified versions and to confirm you never installed a compromised build. The library itself — Bootstrap components rewritten as native Angular directives by the Valor Software team — is not inherently dangerous. What makes ngx-bootstrap worth a security guide is that it became a real-world supply-chain target, plus a known cross-site scripting issue in one of its components. This post covers both, and how to keep the ngx bootstrap dependency from becoming a liability.

What ngx-bootstrap is

ngx-bootstrap provides Angular-native implementations of Bootstrap's UI components — datepickers, modals, tooltips, typeaheads, carousels — without pulling in jQuery or Bootstrap's own JavaScript. You get the Bootstrap look and behavior as proper Angular components with bindings and change detection. Teams reach for it because it is one of the more complete Angular component libraries and tracks Angular's major versions closely.

Installation is the standard ngx-bootstrap npm flow:

npm install ngx-bootstrap

If you search ngx bootstrap npm you will find the package under the Valor Software organization, with versioning that broadly follows the Angular release it targets.

The September 2025 supply-chain compromise

In September 2025, ngx-bootstrap was one of the packages caught in a wave of npm account compromises (the same campaign that hit @ctrl/tinycolor and spread through the self-replicating "Shai-Hulud" pattern). Attackers published malicious releases that carried a postinstall script — bundle.js — designed to exfiltrate secrets and credentials from any machine that ran npm install against the poisoned version. GitHub tracked it in advisory GHSA-6m4g-vm7c-f8w6, classified as malware, with the standard and serious guidance for that category: treat any host that installed an affected version as compromised.

The malicious releases (reported in the 20.0.4 through 20.0.6 range and 19.0.3, among others) were removed from npm once discovered. But "removed from npm" does not clean your lockfile, your CI cache, or a developer laptop that already ran the install. If your project touched ngx-bootstrap in that window, the response is incident response, not just a version bump: rotate any credentials that were present in the affected environments and rebuild from a clean base.

You can check whether a compromised version ever entered your tree:

npm ls ngx-bootstrap
grep -n "ngx-bootstrap" package-lock.json

Then compare against the versions listed in GHSA-6m4g-vm7c-f8w6 and pin to a current, clean release above them.

The typeahead XSS issue

Separate from the supply-chain incident, ngx-bootstrap has a documented cross-site scripting issue in its typeahead component (tracked by Snyk as SNYK-JS-NGXBOOTSTRAP-174319). The search-and-highlight functionality does not escape special characters in the matched text, so if the typeahead renders attacker-influenced strings, markup can be injected into the DOM. At the time of writing there is no upstream fixed version, which means the mitigation is on you: sanitize or strictly validate any user-controllable data before it reaches a typeahead's option list, and rely on Angular's built-in contextual output encoding rather than binding through [innerHTML].

This is a good reminder that Angular gives you strong XSS defenses by default — interpolation escapes automatically — and the way you defeat them is by reaching for bypassSecurityTrust* APIs or innerHTML with unsanitized data. Keep those out of any code path that renders ngx-bootstrap component content.

Using ngx-bootstrap safely

A few practices keep the dependency in a good place:

• Pin exact versions and commit the lockfile. Use npm ci in CI so a republished tarball for the same version string cannot silently change what you build. This is the single control that would have limited the blast radius of the September 2025 incident.
• Disable install scripts where you can. Running npm install --ignore-scripts in CI and production builds neutralizes the postinstall exfiltration vector that the malicious ngx-bootstrap releases used. Allowlist the few packages that genuinely need build scripts.
• Watch advisories on this specific package. Because it has been targeted once, subscribe to GitHub Dependabot alerts or an SCA tool for ngx-bootstrap so a future compromise reaches you as an alert, not as a breach.
• Sanitize typeahead input. Treat any data flowing into the typeahead component as untrusted until proven otherwise.

An SCA tool such as Safeguard can flag both classes of problem — a known-malicious version sitting in your lockfile and the typeahead XSS advisory — including cases where ngx-bootstrap arrived transitively through an internal Angular shared library rather than your top-level package.json.

The broader lesson for frontend dependencies

The ngx-bootstrap story is not really about one library. A popular, trusted, low-churn frontend package is exactly the kind of target attackers now prioritize, because a single compromised release reaches thousands of build pipelines before anyone notices. The defenses are the same ones that apply across the ecosystem: pin versions, disable install scripts, monitor advisories, and keep a bill of materials so you can answer "did we ship the bad version?" in minutes. Our 10 npm security best practices walk through that playbook in full.

FAQ

Is ngx-bootstrap safe to use?

Yes, when pinned to a current, clean release and installed with scripts disabled in CI. The library is legitimate; the risk came from malicious versions published during the September 2025 npm compromise, which have since been removed.

How do I know if I installed a compromised ngx-bootstrap version?

Run npm ls ngx-bootstrap and inspect package-lock.json, then compare against the versions named in advisory GHSA-6m4g-vm7c-f8w6. If a compromised version ever ran in an environment, rotate credentials and rebuild from clean.

Does ngx-bootstrap have an XSS vulnerability?

Its typeahead component has a documented XSS issue in search-and-highlight (SNYK-JS-NGXBOOTSTRAP-174319) with no upstream fix. Sanitize any user-controllable data before it reaches the typeahead and avoid binding it through innerHTML.

How can I prevent npm supply-chain attacks like the ngx-bootstrap one?

Pin exact versions, commit your lockfile, use npm ci, run installs with --ignore-scripts, and monitor advisories with Dependabot or an SCA tool so a malicious republish reaches you as an alert instead of a breach.