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CVE-2026-33151

Socket.IO is an open source, real-time, bidirectional, event-based, communication framework. Prior to versions 3.3.5, 3.4.4, and 4.2.6, a specially crafted Socket.IO packet can make the server wait for a large number of binary attachments and buffer them, which can be exploited to make the server run out of memory. This issue has been patched in versions 3.3.5, 3.4.4, and 4.2.6.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:20659bc83f1b03c758d273daa7f9b35fc0d38d2535f1c90ae7b8e2f94bb7076e
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-754","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"socket.io","vendor":"socketio","versions":[{"status":"affected","version":"< 3.3.5"},{"status":"affected","version":">= 3.4.0, < 3.4.4"},{"status":"affected","version":">= 4.0.0, < 4.2.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-754","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/references/1
{"name":"https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/references/2
{"name":"https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /containers/cna/references/3
{"name":"https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c699830fe2f7c16824734cfc04b750450911253b3bdd9e6ab43dbcafe39c80d7 · sha256:de300f9ebd4391bf… · /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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