CVE-2026-2229 (GCVE-0-2026-2229)

Vulnerability from cvelistv5 – Published: 2026-03-12 20:27 – Updated: 2026-06-30 12:06
VLAI
Title
undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation
Summary
ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the server_max_window_bits parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range server_max_window_bits value (outside zlib's valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination. The vulnerability exists because: * The isValidClientWindowBits() function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15 * The createInflateRaw() call is not wrapped in a try-catch block * The resulting exception propagates up through the call stack and crashes the Node.js process
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-248 - Uncaught exception
  • CWE-1284 - Improper validation of specified quantity in input
  • CWE-248 - Uncaught Exception
Assigner
References
URL Tags
https://github.com/nodejs/undici/security/advisor…
https://hackerone.com/reports/3487486
https://cna.openjsf.org/security-advisories.html
https://datatracker.ietf.org/doc/html/rfc7692
https://nodejs.org/api/zlib.html#class-zlibinflateraw
https://access.redhat.com/security/cve/CVE-2026-2229 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447143 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:17789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7310 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7080 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7675 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7123 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7670 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7983 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7302 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:7350 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:9742 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13826 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:5807 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21772 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21931 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
undici undici Affected: < 6.24.0; 7.0.0 < 7.24.0
Unaffected: 6.24.0: 7.24.0
Create a notification for this product.
Red Hat Cryostat 4 on RHEL 9     cpe:/a:redhat:cryostat:4::el9
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
 Create a notification for this product.
Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
 Create a notification for this product.
Red Hat Red Hat Developer Hub 1.8     cpe:/a:redhat:rhdh:1.8::el9
 Create a notification for this product.
Red Hat Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::el9
 Create a notification for this product.
Red Hat Red Hat OpenShift AI 2.16     cpe:/a:redhat:openshift_ai:2.16::el8
 Create a notification for this product.
Red Hat Red Hat OpenShift Dev Spaces 3.28     cpe:/a:redhat:openshift_devspaces:3.28::el9
 Create a notification for this product.
Red Hat Red Hat OpenShift Pipelines 1.2     cpe:/a:redhat:openshift_pipelines:1.20::el9
 Create a notification for this product.
Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
 Create a notification for this product.
Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
 Create a notification for this product.
Red Hat Red Hat Developer Hub     cpe:/a:redhat:rhdh:1
 Create a notification for this product.
Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
 Create a notification for this product.
Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
 Create a notification for this product.
Red Hat Red Hat JBoss Enterprise Application Platform 8     cpe:/a:redhat:jboss_enterprise_application_platform:8
 Create a notification for this product.
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
 Create a notification for this product.
Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
 Create a notification for this product.
Credits
Matteo Collina Ulises Gascón Rafael Gonzaga Ethan Arrowood Aisle Research
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-2229",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-13T13:06:30.575811Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-13T13:06:46.814Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:/a:redhat:cryostat:4::el9"
            ],
            "defaultStatus": "affected",
            "product": "Cryostat 4 on RHEL 9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux_eus:10.0"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v. 10.0)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 10)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:8::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 8)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhel_eus:9.6::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream EUS (v.9.6)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux:9::appstream"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhdh:1.8::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Developer Hub 1.8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhdh:1.9::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Developer Hub 1.9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_ai:2.16::el8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift AI 2.16",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_devspaces:3.28::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Dev Spaces 3.28",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_pipelines:1.20::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Pipelines 1.2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_lightspeed"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Lightspeed",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_pipelines:1"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Pipelines",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhdh:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Developer Hub",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_ai"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift AI (RHOAI)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ansible_portal:2"
            ],
            "defaultStatus": "affected",
            "product": "Self-service automation portal 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jboss_enterprise_application_platform:8"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat JBoss Enterprise Application Platform 8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:jbosseapxp"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_devspaces:3"
            ],
            "defaultStatus": "unaffected",
            "product": "Red Hat OpenShift Dev Spaces",
            "vendor": "Red Hat"
          }
        ],
        "datePublic": "2026-03-12T20:27:05.600Z",
        "descriptions": [
          {
            "lang": "en",
            "value": "A flaw was found in the undici WebSocket client. A remote malicious server can exploit this vulnerability by sending a WebSocket frame with an invalid `server_max_window_bits` parameter within the permessage-deflate extension. This improper validation causes the client\u0027s Node.js process to terminate, leading to a denial-of-service (DoS) condition for the client."
          }
        ],
        "metrics": [
          {
            "other": {
              "content": {
                "namespace": "https://access.redhat.com/security/updates/classification/",
                "value": "Important"
              },
              "type": "Red Hat severity rating"
            }
          },
          {
            "cvssV3_1": {
              "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"
            },
            "format": "CVSS"
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-248",
                "description": "Uncaught Exception",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-30T12:06:58.858Z",
          "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
          "shortName": "redhat-SADP"
        },
        "references": [
          {
            "tags": [
              "vdb-entry",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/security/cve/CVE-2026-2229"
          },
          {
            "name": "RHBZ#2447143",
            "tags": [
              "issue-tracking",
              "x_refsource_REDHAT"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447143"
          },
          {
            "tags": [
              "x_sadp-csaf-vex"
            ],
            "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2229.json"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:17789"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7310"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7080"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7675"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7123"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7670"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7983"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7302"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:7350"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:9742"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:13826"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:5807"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:21772"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:21931"
          }
        ],
        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:17789: Cryostat 4 on RHEL 9"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7310: Red Hat Enterprise Linux AppStream EUS (v. 10.0)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7080: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7675: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7123: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7670: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7983: Red Hat Enterprise Linux AppStream EUS (v.9.6)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7302: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:7350: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:9742: Red Hat Developer Hub 1.8"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:13826: Red Hat Developer Hub 1.9"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:5807: Red Hat OpenShift AI 2.16"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:21772: Red Hat OpenShift Dev Spaces 3.28"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:21931: Red Hat OpenShift Pipelines 1.2"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-03-12T21:01:29.187Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-03-12T20:27:05.600Z",
            "value": "Made public."
          }
        ],
        "title": "undici: Undici: Denial of Service via invalid WebSocket permessage-deflate extension parameter",
        "workarounds": [
          {
            "lang": "en",
            "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/nodejs/undici/",
          "defaultStatus": "unaffected",
          "packageName": "undici",
          "product": "undici",
          "repo": "https://github.com/nodejs/undici/",
          "vendor": "undici",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 6.24.0; 7.0.0 \u003c 7.24.0"
            },
            {
              "status": "unaffected",
              "version": "6.24.0: 7.24.0"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Matteo Collina"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Ulises Gasc\u00f3n"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Rafael Gonzaga"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Ethan Arrowood"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Aisle Research"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003ch3\u003e\u003cspan\u003eImpact\u003c/span\u003e\u003c/h3\u003e\u003cp\u003eThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the\u0026nbsp;\u003ccode\u003eserver_max_window_bits\u003c/code\u003e\u0026nbsp;parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range\u0026nbsp;\u003ccode\u003eserver_max_window_bits\u003c/code\u003e\u0026nbsp;value (outside zlib\u0027s valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.\u003c/p\u003e\u003cp\u003eThe vulnerability exists because:\u003c/p\u003e\u003col\u003e\u003cli\u003eThe\u0026nbsp;\u003ccode\u003eisValidClientWindowBits()\u003c/code\u003e\u0026nbsp;function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15\u003c/li\u003e\u003cli\u003eThe\u0026nbsp;\u003ccode\u003ecreateInflateRaw()\u003c/code\u003e\u0026nbsp;call is not wrapped in a try-catch block\u003c/li\u003e\u003cli\u003eThe resulting exception propagates up through the call stack and crashes the Node.js process\u003c/li\u003e\u003c/ol\u003e\u003cbr\u003e"
            }
          ],
          "value": "ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the\u00a0server_max_window_bits\u00a0parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range\u00a0server_max_window_bits\u00a0value (outside zlib\u0027s valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.\n\nThe vulnerability exists because:\n\n  *  The\u00a0isValidClientWindowBits()\u00a0function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15\n  *  The\u00a0createInflateRaw()\u00a0call is not wrapped in a try-catch block\n  *  The resulting exception propagates up through the call stack and crashes the Node.js process"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-248",
              "description": "CWE-248 Uncaught exception",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1284",
              "description": "CWE-1284 Improper validation of specified quantity in input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-12T20:27:05.600Z",
        "orgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
        "shortName": "openjs"
      },
      "references": [
        {
          "url": "https://github.com/nodejs/undici/security/advisories/GHSA-v9p9-hfj2-hcw8"
        },
        {
          "url": "https://hackerone.com/reports/3487486"
        },
        {
          "url": "https://cna.openjsf.org/security-advisories.html"
        },
        {
          "url": "https://datatracker.ietf.org/doc/html/rfc7692"
        },
        {
          "url": "https://nodejs.org/api/zlib.html#class-zlibinflateraw"
        }
      ],
      "source": {
        "advisory": "GHSA-v9p9-hfj2-hcw8",
        "discovery": "UNKNOWN"
      },
      "title": "undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation",
      "x_generator": {
        "engine": "Vulnogram 1.0.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ce714d77-add3-4f53-aff5-83d477b104bb",
    "assignerShortName": "openjs",
    "cveId": "CVE-2026-2229",
    "datePublished": "2026-03-12T20:27:05.600Z",
    "dateReserved": "2026-02-08T17:51:16.985Z",
    "dateUpdated": "2026-06-30T12:06:58.858Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-2229",
      "date": "2026-06-30",
      "epss": "0.00874",
      "percentile": "0.54391"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-2229\",\"sourceIdentifier\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"published\":\"2026-03-12T21:16:25.573\",\"lastModified\":\"2026-06-30T03:18:12.177\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the\u00a0server_max_window_bits\u00a0parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range\u00a0server_max_window_bits\u00a0value (outside zlib\u0027s valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.\\n\\nThe vulnerability exists because:\\n\\n  *  The\u00a0isValidClientWindowBits()\u00a0function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15\\n  *  The\u00a0createInflateRaw()\u00a0call is not wrapped in a try-catch block\\n  *  The resulting exception propagates up through the call stack and crashes the Node.js process\"},{\"lang\":\"es\",\"value\":\"Impacto\\nEl cliente WebSocket undici es vulnerable a un ataque de denegaci\u00f3n de servicio debido a la validaci\u00f3n incorrecta del par\u00e1metro server_max_window_bits en la extensi\u00f3n permessage-deflate. Cuando un cliente WebSocket se conecta a un servidor, anuncia autom\u00e1ticamente soporte para la compresi\u00f3n permessage-deflate. Un servidor malicioso puede responder con un valor server_max_window_bits fuera de rango (fuera del rango v\u00e1lido de zlib de 8-15). Cuando el servidor env\u00eda posteriormente un frame comprimido, el cliente intenta crear una instancia zlib InflateRaw con el valor windowBits no v\u00e1lido, causando una excepci\u00f3n RangeError s\u00edncrona que no es capturada, lo que resulta en la terminaci\u00f3n inmediata del proceso.\\n\\nLa vulnerabilidad existe porque:\\n\\n  *  La funci\u00f3n isValidClientWindowBits() solo valida que el valor contiene d\u00edgitos ASCII, no que caiga dentro del rango v\u00e1lido 8-15\\n  *  La llamada a createInflateRaw() no est\u00e1 envuelta en un bloque try-catch\\n  *  La excepci\u00f3n resultante se propaga a trav\u00e9s de la pila de llamadas y bloquea el proceso de Node.js\"}],\"affected\":[{\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"affectedData\":[{\"vendor\":\"undici\",\"product\":\"undici\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com/nodejs/undici/\",\"packageName\":\"undici\",\"repo\":\"https://github.com/nodejs/undici/\",\"versions\":[{\"version\":\"\u003c 6.24.0; 7.0.0 \u003c 7.24.0\",\"status\":\"affected\"},{\"version\":\"6.24.0: 7.24.0\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red Hat\",\"product\":\"Cryostat 4 on RHEL 9\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:cryostat:4::el9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux AppStream EUS (v. 10.0)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux_eus:10.0\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux AppStream (v. 10)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/o:redhat:enterprise_linux:10.1\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux AppStream (v. 8)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:enterprise_linux:8::appstream\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux AppStream EUS (v.9.6)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:rhel_eus:9.6::appstream\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Enterprise Linux AppStream (v. 9)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:enterprise_linux:9::appstream\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Developer Hub 1.8\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:rhdh:1.8::el9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Developer Hub 1.9\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:rhdh:1.9::el9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenShift AI 2.16\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift_ai:2.16::el8\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenShift Dev Spaces 3.28\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift_devspaces:3.28::el9\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenShift Pipelines 1.2\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift_pipelines:1.20::el9\"]},{\"vendor\":\"Red Hat\",\"product\":\"OpenShift Lightspeed\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift_lightspeed\"]},{\"vendor\":\"Red Hat\",\"product\":\"OpenShift Pipelines\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift_pipelines:1\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat Developer Hub\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:rhdh:1\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenShift AI (RHOAI)\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift_ai\"]},{\"vendor\":\"Red Hat\",\"product\":\"Self-service automation portal 2\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:ansible_portal:2\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat JBoss Enterprise Application Platform 8\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/a:redhat:jboss_enterprise_application_platform:8\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat JBoss Enterprise Application Platform Expansion Pack\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/a:redhat:jbosseapxp\"]},{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenShift Dev Spaces\",\"defaultStatus\":\"unaffected\",\"cpes\":[\"cpe:/a:redhat:openshift_devspaces:3\"]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-03-13T13:06:30.575811Z\",\"id\":\"CVE-2026-2229\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-248\"},{\"lang\":\"en\",\"value\":\"CWE-1284\"}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-248\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*\",\"versionEndExcluding\":\"6.24.0\",\"matchCriteriaId\":\"C08CE582-019D-4A06-910A-6010C2D6EF4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*\",\"versionStartIncluding\":\"7.0.0\",\"versionEndExcluding\":\"7.24.0\",\"matchCriteriaId\":\"F016E7D9-C45A-4DEF-9AD8-F0581AF5E509\"}]}]}],\"references\":[{\"url\":\"https://cna.openjsf.org/security-advisories.html\",\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://datatracker.ietf.org/doc/html/rfc7692\",\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"tags\":[\"Technical Description\"]},{\"url\":\"https://github.com/nodejs/undici/security/advisories/GHSA-v9p9-hfj2-hcw8\",\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://hackerone.com/reports/3487486\",\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"tags\":[\"Permissions Required\"]},{\"url\":\"https://nodejs.org/api/zlib.html#class-zlibinflateraw\",\"source\":\"ce714d77-add3-4f53-aff5-83d477b104bb\",\"tags\":[\"Technical Description\"]},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:13826\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:17789\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:21772\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:21931\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:5807\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7080\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7123\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7302\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7310\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7350\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7670\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7675\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:7983\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/errata/RHSA-2026:9742\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://access.redhat.com/security/cve/CVE-2026-2229\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=2447143\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"},{\"url\":\"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2229.json\",\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-2229\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-13T13:06:30.575811Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-13T13:06:41.726Z\"}}], \"cna\": {\"title\": \"undici is vulnerable to Unhandled Exception in undici WebSocket Client Due to Invalid server_max_window_bits Validation\", \"source\": {\"advisory\": \"GHSA-v9p9-hfj2-hcw8\", \"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Matteo Collina\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"Ulises Gasc\\u00f3n\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"Rafael Gonzaga\"}, {\"lang\": \"en\", \"type\": \"remediation reviewer\", \"value\": \"Ethan Arrowood\"}, {\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Aisle Research\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/nodejs/undici/\", \"vendor\": \"undici\", \"product\": \"undici\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 6.24.0; 7.0.0 \u003c 7.24.0\"}, {\"status\": \"unaffected\", \"version\": \"6.24.0: 7.24.0\"}], \"packageName\": \"undici\", \"collectionURL\": \"https://github.com/nodejs/undici/\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://github.com/nodejs/undici/security/advisories/GHSA-v9p9-hfj2-hcw8\"}, {\"url\": \"https://hackerone.com/reports/3487486\"}, {\"url\": \"https://cna.openjsf.org/security-advisories.html\"}, {\"url\": \"https://datatracker.ietf.org/doc/html/rfc7692\"}, {\"url\": \"https://nodejs.org/api/zlib.html#class-zlibinflateraw\"}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"ImpactThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the\\u00a0server_max_window_bits\\u00a0parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range\\u00a0server_max_window_bits\\u00a0value (outside zlib\u0027s valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.\\n\\nThe vulnerability exists because:\\n\\n  *  The\\u00a0isValidClientWindowBits()\\u00a0function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15\\n  *  The\\u00a0createInflateRaw()\\u00a0call is not wrapped in a try-catch block\\n  *  The resulting exception propagates up through the call stack and crashes the Node.js process\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003ch3\u003e\u003cspan\u003eImpact\u003c/span\u003e\u003c/h3\u003e\u003cp\u003eThe undici WebSocket client is vulnerable to a denial-of-service attack due to improper validation of the\u0026nbsp;\u003ccode\u003eserver_max_window_bits\u003c/code\u003e\u0026nbsp;parameter in the permessage-deflate extension. When a WebSocket client connects to a server, it automatically advertises support for permessage-deflate compression. A malicious server can respond with an out-of-range\u0026nbsp;\u003ccode\u003eserver_max_window_bits\u003c/code\u003e\u0026nbsp;value (outside zlib\u0027s valid range of 8-15). When the server subsequently sends a compressed frame, the client attempts to create a zlib InflateRaw instance with the invalid windowBits value, causing a synchronous RangeError exception that is not caught, resulting in immediate process termination.\u003c/p\u003e\u003cp\u003eThe vulnerability exists because:\u003c/p\u003e\u003col\u003e\u003cli\u003eThe\u0026nbsp;\u003ccode\u003eisValidClientWindowBits()\u003c/code\u003e\u0026nbsp;function only validates that the value contains ASCII digits, not that it falls within the valid range 8-15\u003c/li\u003e\u003cli\u003eThe\u0026nbsp;\u003ccode\u003ecreateInflateRaw()\u003c/code\u003e\u0026nbsp;call is not wrapped in a try-catch block\u003c/li\u003e\u003cli\u003eThe resulting exception propagates up through the call stack and crashes the Node.js process\u003c/li\u003e\u003c/ol\u003e\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-248\", \"description\": \"CWE-248 Uncaught exception\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1284\", \"description\": \"CWE-1284 Improper validation of specified quantity in input\"}]}], \"providerMetadata\": {\"orgId\": \"ce714d77-add3-4f53-aff5-83d477b104bb\", \"shortName\": \"openjs\", \"dateUpdated\": \"2026-03-12T20:27:05.600Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-2229\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-13T13:06:46.814Z\", \"dateReserved\": \"2026-02-08T17:51:16.985Z\", \"assignerOrgId\": \"ce714d77-add3-4f53-aff5-83d477b104bb\", \"datePublished\": \"2026-03-12T20:27:05.600Z\", \"assignerShortName\": \"openjs\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.