CVE-2026-33151

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
40.7%
KEV
Not listed

Published

March 20, 2026

Last Modified

April 14, 2026

Advisory Details (4)

Auto-updated Jun 10, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Unbounded number of binary attachments · Advisory · socketio/socket.io · GitHub

https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9
github_commit Patch Available

commit b25738c416c4 (socketio/socket.io)

Patch available: socketio/socket.io engine.io@6.6.7 (contains commit b25738c416c4)

https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78
github_commit Patch Available

commit 9d39f1f08051 (socketio/socket.io)

Patch available: socketio/socket.io socket.io-parser@3.3.5 (contains commit 9d39f1f08051)

https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf
github_commit Patch Available

commit 719f9ebab077 (socketio/socket.io)

Patch available: socketio/socket.io socket.io-parser@3.4.4 (contains commit 719f9ebab077)

https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
socket.io-parser—4.2.6—

Data Freshness Timeline

(refreshed 13× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:09 UTCEG score recompute
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  11. 2026-07-17 07:46 UTCOSV refresh
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  1. 2026-07-06 16:27 UTCEPSS rescore
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  11. 2026-06-29 05:32 UTCOSV refresh
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  24. 2026-06-21 14:56 UTCEPSS rescore
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  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-19 19:25 UTCEPSS rescore
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  41. 2026-06-08 14:17 UTCEPSS rescore
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  58. 2026-06-01 08:13 UTCOSV refresh
  59. 2026-05-31 22:30 UTCEPSS rescore
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  73. 2026-05-26 07:18 UTCEPSS rescore
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  75. 2026-05-20 22:38 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-33151?
CVE-2026-33151 is a high vulnerability published on March 20, 2026. 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…
When was CVE-2026-33151 disclosed?
CVE-2026-33151 was first published in the National Vulnerability Database on March 20, 2026, with the most recent update on April 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33151 actively exploited?
CVE-2026-33151 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-33151?
CVE-2026-33151 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-33151?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33151, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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