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CVE-2026-55388

piscina is a node.js worker pool implementation. Prior to 6.0.0-rc.2, 5.2.0, and 4.9.3, piscina's constructor and run() paths read the filename option via plain member access. Both reads fall through the prototype chain when the caller's options object doesn't have filename as an own property. When Object.prototype.filename is polluted upstream the inherited value flows to worker_threads.Worker import and the attacker's .mjs runs in the worker. This vulnerability is fixed in 6.0.0-rc.2, 5.2.0, a
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eb5cbfc1d659a9ae2aacfbc58459688f2777c4d7cc4b4645c1c13da8c393db84
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"piscina","vendor":"piscinajs","versions":[{"status":"affected","version":"< 4.9.3"},{"status":"affected","version":">= 5.0.0-alpha.0, < 5.2.0"},{"status":"affected","version":">= 6.0.0-rc.1, < 6.0.0-rc.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bfa0b93bca551fb5a1a5320efc3bf204d5bfdb35e33fc64dc9d9f8f185d9c500 · sha256:5be84314f46a7c8c… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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