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No exploitation reportedFix available

CVE-2026-33151

No exploitation reported by the sources we read.

  • Published2026-03-20
  • Fixed in4.2.6 · 3.4.4 · 3.3.5
  • WeaknessCWE-20 · CWE-754

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-03-2021:17CVE publishedNVD

Versions per branch

NVD · OSV
Socket socket.io-parser
BranchAffectedFixed in
4.x≥ 4.0.0, < 4.2.64.2.6
3.4≥ 3.4.0, < 3.4.43.4.4
3.3< 3.3.53.3.5

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • socketio socket.io
    Affected
    • = < 3.3.5no fix stated
    • = >= 3.4.0, < 3.4.4no fix stated
    • = >= 4.0.0, < 4.2.6no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-20

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/socket.io-parserRoot:npmall versions · fixed in 4.2.4-root.io.1
  • @rootio/socket.io-parserRoot:npmall versions · fixed in 4.2.4-root.io.2
  • katib-earlystoppingWolfiall versions · fixed in 0.19.0-r31and 8 other packages
  • katib-earlystoppingChainguardall versions · fixed in 0.19.0-r31and 8 other packages
  • katib-suggestion-hyperoptWolfiall versions · fixed in 0.19.0-r40and 1 other package
  • katib-suggestion-hyperoptChainguardall versions · fixed in 0.19.0-r40and 1 other package
  • node-socket.io-parserUbuntu:26.04:LTSall versions · no fixed version listed
  • node-socket.io-parserUbuntu:25.10all versions · no fixed version listed

19 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Socket socket.io-parser to 4.2.6 · 3.4.4 · 3.3.5

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-03-23
  • CNACVSS 4.08.7known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-20, CWE-754known since 2026-10-23
  • FIRST EPSSEPSS score0.5 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-03-18

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
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/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
Published
2026-03-20
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-677m-j7p3-52f9

Frequently asked questions

What is 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.

Is CVE-2026-33151 actively exploited?

Active exploitation of CVE-2026-33151 has not been confirmed. Its EPSS score was 0.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-33151?

CVE-2026-33151 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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