Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-102992

Vulnerability in piscina (CVE-2026-102992)

Summary

Vulnerability in piscina (CVE-2026-102992). Risk of unauthorized operations or information disclosure. Exploitable via ThreadPool.options. Mitigation: upgrade to 6.0.0-rc.5 or later.

Original description

The description as published by the source.

Summary

A prototype-pollution gadget in ThreadPool.options allows an attacker who can pollute Object.prototype to execute arbitrary code in Piscina worker threads, invoke arbitrary functions during task scheduling, or inject environment variables into workers. The root cause is that ThreadPool.options is created as a plain object inheriting from Object.prototype, so any option without an explicit default in kDefaultOptions can be supplied via the prototype chain.

Details

In src/index.ts the ThreadPool constructor builds the resolved options object as a plain object:

this.options = { ...kDefaultOptions, ...options, filename, maxQueue: 0 }

Because this object has Object.prototype as its prototype, reads for properties that are not own properties of the object and are not present in kDefaultOptions fall back to Object.prototype. This means a prototype-pollution primitive (e.g. from a vulnerable merge() or JSON.parse merge elsewhere in the application) can inject values for execArgv, env, loadBalancer, argv, workerData, resourceLimits, niceIncrement, closeTimeout, recordTiming, stricterFIFO, workerHistogram, and trackUnmanagedFds.

The most serious gadget is execArgv, which is passed directly to new Worker(..., { execArgv }). An attacker can set Object.prototype.execArgv = ['--require', '/tmp/attacker.js'], causing every worker to preload and execute the attacker-controlled module on startup.

This issue…

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-2026-102992 has been found in piscina.
Attackers can target a specific entry point like ThreadPool.options over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade piscina to 6.0.0-rc.5 or later.
If unsure, ask your IT team or search "piscina CVE-2026-102992" on the vendor's site.

CVE-2026-102992 (piscina) — CWE-1321
Attack surface: ThreadPool.options / Object.prototype / kDefaultOptions / ThreadPool
Patched: 6.0.0-rc.5 — 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.

❓ What is the problem

A vulnerability (CWE-1321) exists in piscina. Attackers reach the vulnerable code path via ThreadPool.options.

📍 Affected scope

Check the vendor advisory for the affected versions of piscina. Attack surface: ThreadPool.options / Object.prototype / kDefaultOptions / ThreadPool.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 6.0.0-rc.5.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'piscina' . 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

  1. 1
    Identify exposure identify 
    grep -r 'piscina' . | 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 piscina を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade piscina to 6.0.0-rc.5

    ステージング環境で 6.0.0-rc.5 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。

  3. 3
    Post-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

npm piscina
[{"type":"SEMVER","events":[{"introduced":"6.0.0-rc.1"},{"fixed":"6.0.0-rc.5"}]}]

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details