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CVE-2026-45357— LiquidJS: Memory and render limit bypass via unbounded width padding in `date` filter (strftime)

Quick assessment

Affected
harttle liquidjs
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

harttle liquidjs是harttle的嵌入式Web服务器。 harttle liquidjs 10.25.7及之前版本存在安全漏洞，该漏洞源于日期过滤器的strftime实现中未检查宽度说明符，将捕获的宽度无限制传入pad()/padStart()，导致内存和渲染限制绕过，可能造成大量内存分配、CPU使用率高或内存耗尽崩溃。

CVSS 7.5 · High EPSS 0.39% · P32

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
harttle liquidjs < 10.26.0 affected
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I. Basic Information for CVE-2026-45357

Vulnerability Information
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Vulnerability Title
LiquidJS: Memory and render limit bypass via unbounded width padding in `date` filter (strftime)
Source: CVE Program / CVE List V5
Vulnerability Description
LiquidJS is a Shopify/GitHub Pages compatible template engine written in pure JavaScript. In versions 10.25.7 and below, the date filter's strftime implementation parses width specifiers like %9999999d and forwards the captured width unchecked into pad()/padStart(), leading to memory and render limit bypass. In src/util/underscore.ts, the pad loop performs unbounded string concatenation without consulting the Context's memoryLimit or renderLimit, so a single small template ({{ x | date: '%5000000d' }}) produces megabytes of output and unbounded CPU. The memoryLimit and renderLimit options the docs (src/liquid-options.ts:87-92) advertise as DoS controls — and which the docstring explicitly mentions for strftime — are entirely bypassed. Exploitation can cause large memory allocations, high CPU usage, or OOM crashes per render. This issue has been fixed in version 10.26.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
harttle liquidjs 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
harttle liquidjs是harttle的嵌入式Web服务器。 harttle liquidjs 10.25.7及之前版本存在安全漏洞，该漏洞源于日期过滤器的strftime实现中未检查宽度说明符，将捕获的宽度无限制传入pad()/padStart()，导致内存和渲染限制绕过，可能造成大量内存分配、CPU使用率高或内存耗尽崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
harttle liquidjs < 10.26.0 -

II. Public POCs for CVE-2026-45357

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Qwen3.6-35B-A3B · 6754 chars
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III. Intelligence Information for CVE-2026-45357

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Vendor Advisories for CVE-2026-45357 (1)

Vendor Pages for CVE-2026-45357 (1)

Same Patch Batch · harttle · 2026-06-17 · 5 CVEs total

CVE-2026-45617 7.5 HIGH LiquidJS: ReDoS via Quadratic Backtracking in `strip_html` Filter Regex
CVE-2026-44645 6.5 MEDIUM LiquidJS has a renderLimit DoS guard bypass via empty `{% for %}` body
CVE-2026-44644 6.1 MEDIUM LiquidJS's strip_html filter bypass via newline characters in HTML tags enables XSS
CVE-2026-44646 5.3 MEDIUM LiquidJS: `{% render %}` tag silently bypasses per-render `ownPropertyOnly:true` via `Cont

IV. Related Vulnerabilities

Same product: liquidjs
Same vendor: harttle
Same weakness: CWE-400

V. Comments for CVE-2026-45357

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