GHSA-677M-J7P3-52F9

Vulnerability from github – Published: 2026-03-18 17:26 – Updated: 2026-03-20 21:33
VLAI?
Summary
socket.io allows an unbounded number of binary attachments
Details

Impact

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.

Patches

Version range Used by Fixed version
>=4.0.0 <4.2.6 socket.io@4.x and socket.io-client@4.x 4.2.6
>=3.4.0 <3.4.4 socket.io@2.x 3.4.4
<3.3.5 socket.io-client@2.x 3.3.5

Workarounds

There is no known workaround except upgrading to a safe version.

For more information

If you have any questions or comments about this advisory:

  • Open a discussion here
Severity ?
8.7 (High)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "socket.io-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "socket.io-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.4.0"
            },
            {
              "fixed": "3.4.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "socket.io-parser"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33151"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-754"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-18T17:26:14Z",
    "nvd_published_at": "2026-03-20T21:17:15Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA 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.\n\n### Patches\n\n| Version range    | Used by                                    | Fixed version |\n|------------------|--------------------------------------------|---------------|\n| `\u003e=4.0.0 \u003c4.2.6` | `socket.io@4.x` and `socket.io-client@4.x` | `4.2.6`       |\n| `\u003e=3.4.0 \u003c3.4.4` | `socket.io@2.x`                            | `3.4.4`       |\n| `\u003c3.3.5`         | `socket.io-client@2.x`                     | `3.3.5`       |\n\n### Workarounds\n\nThere is no known workaround except upgrading to a safe version.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n- Open a discussion [here](https://github.com/socketio/socket.io/discussions)",
  "id": "GHSA-677m-j7p3-52f9",
  "modified": "2026-03-20T21:33:51Z",
  "published": "2026-03-18T17:26:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/socketio/socket.io/security/advisories/GHSA-677m-j7p3-52f9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33151"
    },
    {
      "type": "WEB",
      "url": "https://github.com/socketio/socket.io/commit/719f9ebab0772ffb882bd614b387e585c1aa75d4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/socketio/socket.io/commit/9d39f1f080510f036782f2177fac701cc041faaf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/socketio/socket.io/commit/b25738c416c4e32fbff62ee182afa8f6d0dacf78"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/socketio/socket.io"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "socket.io allows an unbounded number of binary attachments"
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.