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CVE

CVE-2026-102992

piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
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CVE

CVE-2026-102992

piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.2
-
4.0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/piscinajs/piscina/releases/tag/v4.9.4, https://github.com/piscinajs/piscina/releases/tag/v5.3.2, https://github.com/piscinajs/piscina/releases/tag/v6.0.0-rc.5, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102992.json, https://github.com/piscinajs/piscina/security/advisories/GHSA-67c8-pqhq-4rmx, https://nvd.nist.gov/vuln/detail/CVE-2026-102992, https://github.com/piscinajs/piscina/commit/0cb12fca37f526065b072592afe954574dcc656f, https://github.com/piscinajs/piscina/commit/2f69f67159a0e48b38fd61fa4a91c2fdc19fff72, https://github.com/piscinajs/piscina/commit/5be7bbb19e3787bb698862cd516121a578d690f7, https://github.com/piscinajs/piscina/commit/bebbda255c2981cecddd36b171b94be2fd41c9a6

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00512%
EPSS Percentile
0.43386%
Introduced Version
0
Fix Available
bebbda255c2981cecddd36b171b94be2fd41c9a6,2026.10.12_git13040712100108-r0,8.19.22-r5,9.4.7-r4,9.5.4-r3,4.49.0-r2

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