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CVE-2026-59724

Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:ffb989f23521b75193ab08c84c2b1b7e95dae62ea343cf2fa50a79128258fd82
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"socket.io","vendor":"socketio","versions":[{"status":"affected","version":">= 6.5.0, < 6.6.7"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:11017dd3b68af84680d52a81a97734d05b594d64ffbf3aed8405208f852d2add · sha256:f7a635f3e00d4234… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:11017dd3b68af84680d52a81a97734d05b594d64ffbf3aed8405208f852d2add · sha256:f7a635f3e00d4234… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:11017dd3b68af84680d52a81a97734d05b594d64ffbf3aed8405208f852d2add · sha256:f7a635f3e00d4234… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11017dd3b68af84680d52a81a97734d05b594d64ffbf3aed8405208f852d2add · sha256:f7a635f3e00d4234… · /containers/cna/references/1
{"name":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11017dd3b68af84680d52a81a97734d05b594d64ffbf3aed8405208f852d2add · sha256:f7a635f3e00d4234… · /containers/cna/references/2
{"name":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:11017dd3b68af84680d52a81a97734d05b594d64ffbf3aed8405208f852d2add · sha256:f7a635f3e00d4234… · /containers/cna/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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