CVE Explorer

CVE-2026-59725

Socket.IO enables bidirectional and low-latency communication for every platform. From 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b65e99fa7a16a6f960b6249e6061d1e15b8aa0ed80057219956bce2eea9436c5

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"socket.io","vendor":"socketio","versions":[{"status":"affected","version":">= 4.1.0, < 6.6.7"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7a987c5b0ac1d2b7b9b8363d02743d6105be971d45ce5e52989d45b11232e0ea · sha256:642a65650376faef… · /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:v2:7a987c5b0ac1d2b7b9b8363d02743d6105be971d45ce5e52989d45b11232e0ea · sha256:642a65650376faef… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-404","description":"CWE-404: Improper Resource Shutdown or Release","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:7a987c5b0ac1d2b7b9b8363d02743d6105be971d45ce5e52989d45b11232e0ea · sha256:642a65650376faef… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7a987c5b0ac1d2b7b9b8363d02743d6105be971d45ce5e52989d45b11232e0ea · sha256:642a65650376faef… · /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:v2:7a987c5b0ac1d2b7b9b8363d02743d6105be971d45ce5e52989d45b11232e0ea · sha256:642a65650376faef… · /containers/cna/references/2

{"name":"https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x","tags":["x_refsource_CONFIRM"],"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7a987c5b0ac1d2b7b9b8363d02743d6105be971d45ce5e52989d45b11232e0ea · sha256:642a65650376faef… · /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.

← Back to CVE Explorer