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EUVD-2026-328608

fkie_cve-2026-44645

LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. In versions 10.25.7 and below, the renderLimit option can be fully bypassed by a {% for %} (or {% tablerow %}) tag whose body is empty. The renderLimit option is documented in docs/source/tutorials/dos.md as the mechanism that "mitigates this by limiting the time consumed by each render() call." The per-iteration time check is reached only when the body contains at least one template node, so a template such as {%- for i in (1..N) -%}{%- endfor -%} iterates the full collection without ever consulting renderLimit. With a configured renderLimit of 50 ms, a single parseAndRenderSync call has been observed to consume 2.26 seconds (~45× over the limit) and scales linearly with N up to memoryLimit, allowing a low-privileged template author to wedge an event-loop thread for an attacker-chosen duration. Deployments that rely on a finite renderLimit for DoS protection (common in multi-tenant template-authoring environments) can still be forced by a single crafted template to monopolize a Node.js event-loop worker for attacker-controlled time, potentially stalling in-flight requests, with availability impact only. This issue has been fixed in version 10.26.0.

GHSA-8xx9-69p8-7jp3 — LiquidJS has a renderLimit DoS guard bypass via empty `{% for %}` body

Affected: npm: liquidjs

## Summary

The `renderLimit` option — documented in `docs/source/tutorials/dos.md` as the mechanism that "mitigates this by limiting the time consumed by each render() call" — can be fully bypassed by a `{% for %}` (or `{% tablerow %}`) tag whose body is empty. The per-iteration time check is reached only when the body contains at least one template node, so a template like `{%- for i in (1..N) -%}{%- endfor -%}` iterates the full collection without ever consulting `renderLimit`. With a configured `renderLimit` of 50 ms, a single `parseAndRenderSync` call has been observed to consume **2.26 seconds** (~45× over the limit) and scales linearly with `N` up to `memoryLimit`, allowing a low-privileged template author to wedge an event-loop thread for an attacker-chosen duration.

## Details

`Render.renderTemplates` is the single point at which `renderLimit` is consulted:

```ts // src/render/render.ts 14: public * renderTemplates (templates: Template[], ctx: Context, emitter?: Emitter): IterableIterator<any> { 15: if (!emitter) { 16: emitter = ctx.opts.keepOutputType ? new KeepingTypeEmitter() : new SimpleEmitter() 17: } 18: const errors = [] 19: for (const tpl of templates) { 20: ctx.renderLimit.check(getPerformance().now()) 21: try { 22: const html = yield tpl.render(ctx, emitter) ... 32: } ```

The check at line 20 lives **inside** the `for (const tpl of templates)` body. When `templates.length === 0`, the loop body never executes, so th…