Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.1, Tinypool constructs ThreadPool.options from a normal options object and reads the execArgv and env worker options in dist/index.js, allowing values inherited from a polluted Object.prototype to be copied into own properties and passed to worker_threads.Worker. An attacker who can first pollute either property can cause each newly spawned worker to load attacker-selected JavaScript through command-line preload arguments or NODE_OPTIONS, resulting in code execution with the host process's privileges and possible access to CI secrets, signing material, or build artifacts. This issue is fixed in version 2.1.1.
CVE-2026-104848
CRITICALPre-NVD 9.59.5—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (40th 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
9.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.5Exploit: Elevated riskExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 9.5
- EG Score
- 9.5CRITICALmedium confidence
- EG Risk
- 59EG Risk 59/100CISA 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 computedSeverity95% × 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
- 0.5%
- EPSS %ILE
- 40th
- 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
October 2, 2026
Last Modified
October 2, 2026
Advisory Details (4)
Auto-updated Oct 2, 2026🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit, github_pr.
github Patch Available🟡 PoC Available
Prototype Pollution gadget in worker options leads to Remote Code Execution · Advisory · tinylibs/tinypool · GitHub
https://github.com/tinylibs/tinypool/security/advisories/GHSA-5gmw-xhrv-c9v3github_release Patch Available
v2.1.1
Patch available: tinylibs/tinypool v2.1.1
https://github.com/tinylibs/tinypool/releases/tag/v2.1.1github_pr Patch Available
fix: guard worker options from proto pollution
Patch available: tinylibs/tinypool v2.1.1 (PR #134 merged 2026-08-23)
https://github.com/tinylibs/tinypool/pull/134github_commit Patch Available
commit 24df4e730e7d (tinylibs/tinypool)
Patch available: tinylibs/tinypool v2.1.1 (contains commit 24df4e730e7d)
https://github.com/tinylibs/tinypool/commit/24df4e730e7d0857a6d226c9b58f8924227404fdWeakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 7× 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.
- 2026-10-03 16:24 UTCEG score recompute
- 2026-10-03 14:25 UTCEPSS rescore
- 2026-10-02 18:19 UTCEG score recompute
- 2026-10-02 17:40 UTCEG score recompute
- 2026-10-02 17:29 UTCEG score recompute
- 2026-10-02 16:30 UTCEG score recompute
- 2026-10-02 16:30 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-104848?
CVE-2026-104848 is a critical vulnerability published on October 2, 2026. Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.1, Tinypool constructs ThreadPool.options from a normal options object and reads the execArgv and env worker options in dist/index.js, allowing values inherited from a polluted Object.prototype to be copied into own…
When was CVE-2026-104848 disclosed?
CVE-2026-104848 was first published on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-104848 actively exploited?
CVE-2026-104848 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-104848?
CVE-2026-104848 has a CVSS base score of 9.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-104848?
A fix for CVE-2026-104848 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-104848
Is Your Infrastructure Affected by CVE-2026-104848?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.