Vulnerability in liquidjs (CVE-2026-69222)
Summary
Vulnerability in liquidjs (CVE-2026-69222). Risk of unauthorized operations or information disclosure. Exploitable via join. Mitigation: upgrade to 10.27.2 or later.
Original description
The description as published by the source.
Summary
The join filter (src/filters/array.ts:8-13) charges memoryLimit by array element count, not by the string length it produces, letting a template bypass a configured memoryLimit and allocate strings far past budget — bounded only by V8/process limits, not by memoryLimit.
Details
// src/filters/array.ts:8-13
export const join = argumentsToValue(function (this: FilterImpl, v: any[], arg: string) {
const array = toArray(v)
const sep = isNil(arg) ? ' ' : stringify(arg)
const complexity = array.length * (1 + sep.length) // element COUNT, not element sizes
this.context.memoryLimit.use(complexity)
return array.join(sep) // allocates sum(element lengths) + separators
})
concat (array.ts:72) is the enabler: it charges by element count too, but only copies references (cheap for both limiter and heap), so an array's element count can be doubled repeatedly at near-zero real cost. join is where the bug lives — it's the call that actually materializes all referenced content into one string, and its own charge (array.length) doesn't reflect that.
Same undercounting class as already-fixed replace (GHSA-mmg9-6m6j-jqqx), replace_first (GHSA-6q5m-63h6-5x4v), date/strftime (GHSA-hh27-hf48-9f5q) — join wasn't covered. Sibling array_to_sentence_string (src/filters/string.ts:210) has the identical defect.
PoC
Live-reproduced against liquidjs@10.27.1, Node v24.3.0.
const…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-69222 has been found in liquidjs.
Attackers can target a specific entry point like join over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade liquidjs to 10.27.2 or later.
If unsure, ask your IT team or search "liquidjs CVE-2026-69222" on the vendor's site.
CVE-2026-69222 (liquidjs) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: join / memoryLimit / concat / array.length
Patched: 10.27.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-400) exists in liquidjs. Attackers reach the vulnerable code path via join without authentication.
Check the vendor advisory for the affected versions of liquidjs. Attack surface: join / memoryLimit / concat / array.length.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 10.27.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'liquidjs' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'liquidjs' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
liquidjsを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade liquidjs to 10.27.2ステージング環境で 10.27.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com