piscina is a node.js worker pool implementation. Prior to 4.9.4, 5.3.2, and 6.0.0-rc.5, Piscina stores ThreadPool.options in src/index.ts as a plain object that inherits from Object.prototype. Applications with a separate prototype-pollution primitive can therefore supply inherited values for security-sensitive options that do not have own defaults. An inherited execArgv value is passed to the Node.js Worker constructor and can preload attacker-controlled code in worker threads, an inherited loadBalancer function can execute during task scheduling, and inherited env values can alter worker environments. This issue is fixed in versions 4.9.4, 5.3.2, and 6.0.0-rc.5.
CVE-2026-102992
CRITICALPre-NVD 9.29.2—Trending — 4 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (35th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.2Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 9.2
- EG Score
- 9.2CRITICALmedium confidence
- EG Risk
- 57EG Risk 57/100CISA SSVC
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity92% × 45%Exploitation40% × 40%Automatability0% × 15%CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.4%
- EPSS %ILE
- 35th
- KEV
- Not listed
CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table
Published
September 30, 2026
Last Modified
September 30, 2026
Advisory Details (8)
Auto-updated Sep 30, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github_release Patch Available
v6.0.0-rc.5
Patch available: piscinajs/piscina v6.0.0-rc.5 (pre-release)
https://github.com/piscinajs/piscina/releases/tag/v6.0.0-rc.5github_release Patch Available
v5.3.2
Patch available: piscinajs/piscina v5.3.2
https://github.com/piscinajs/piscina/releases/tag/v5.3.2github_release Patch Available
v4.9.4
Patch available: piscinajs/piscina v4.9.4
https://github.com/piscinajs/piscina/releases/tag/v4.9.4github_commit
commit bebbda255c29 (piscinajs/piscina)
Fix landed in piscinajs/piscina commit bebbda255c29 — awaiting tagged release
https://github.com/piscinajs/piscina/commit/bebbda255c2981cecddd36b171b94be2fd41c9a6github_commit Patch Available
commit 5be7bbb19e37 (piscinajs/piscina)
Patch available: piscinajs/piscina v6.0.0-rc.5 (contains commit 5be7bbb19e37)
https://github.com/piscinajs/piscina/commit/5be7bbb19e3787bb698862cd516121a578d690f7github_commit Patch Available
commit 2f69f67159a0 (piscinajs/piscina)
Patch available: piscinajs/piscina v5.3.2 (contains commit 2f69f67159a0)
https://github.com/piscinajs/piscina/commit/2f69f67159a0e48b38fd61fa4a91c2fdc19fff72github_commit Patch Available
commit 0cb12fca37f5 (piscinajs/piscina)
Patch available: piscinajs/piscina v4.9.4 (contains commit 0cb12fca37f5)
https://github.com/piscinajs/piscina/commit/0cb12fca37f526065b072592afe954574dcc656fgithub Patch Available🟡 PoC Available
Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env · Advisory · piscinajs/piscina · GitHub
https://github.com/piscinajs/piscina/security/advisories/GHSA-67c8-pqhq-4rmxVendor Advisories for CVE-2026-102992(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- CVE-2026-102992Microsoft Security Response Center (MSRC)Critical
piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
- GHSA-67c8-pqhq-4rmxGitHub Security AdvisoriesCritical
piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| piscina | — | 5.3.2 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 18× in last 7d / 18× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-10-04 12:27 UTCVendor advisory
- 2026-10-04 08:08 UTCVendor advisory
- 2026-10-04 03:49 UTCVendor advisory
- 2026-10-03 23:30 UTCVendor advisory
- 2026-10-03 19:12 UTCVendor advisory
- 2026-10-03 14:53 UTCEG score recompute
- 2026-10-03 14:53 UTCVendor advisory
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-03 10:35 UTCVendor advisory
- 2026-10-02 17:18 UTCEG score recompute
- 2026-10-02 00:01 UTCEG score recompute
- 2026-10-01 19:49 UTCEPSS rescore
- 2026-10-01 01:47 UTCEG score recompute
- 2026-09-30 21:28 UTCEG score recompute
- 2026-09-30 20:56 UTCEG score recompute
- 2026-09-30 20:22 UTCEG score recompute
- 2026-09-30 19:56 UTCEG score recompute
- 2026-09-30 19:55 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Frequently asked(5)
What is CVE-2026-102992?
CVE-2026-102992 is a critical vulnerability published on September 30, 2026. piscina is a node.js worker pool implementation. Prior to 4.9.4, 5.3.2, and 6.0.0-rc.5, Piscina stores ThreadPool.options in src/index.ts as a plain object that inherits from Object.prototype. Applications with a separate prototype-pollution primitive can therefore supply inherited values for…
When was CVE-2026-102992 disclosed?
CVE-2026-102992 was first published on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102992 actively exploited?
CVE-2026-102992 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102992?
CVE-2026-102992 has a CVSS base score of 9.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102992?
A fix for CVE-2026-102992 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102992 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-102992
Is Your Infrastructure Affected by CVE-2026-102992?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.