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LangGraph SDK custom auth silently ignores actions= on resource decorators

Type: advisorySources: OSV

LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-104873
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:13 UTC · Revision 1

Source evidence

LangGraph SDK custom auth silently ignores actions= on resource decorators

core-osv · Original source

Published 2 Oct 2026, 20:06 UTC

LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.

osv:CVE-2026-104873
Complete source record
{
  "id": "6f2d1f3667c6ae83bde53c733ee4cdc11fca217d0a3e9465ef924cb1b76b0ebd",
  "url": "https://osv.dev/vulnerability/CVE-2026-104873",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "LangGraph SDK custom auth silently ignores actions= on resource decorators",
    "summary": "LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. From 0.1.45 until 0.4.4, the langgraph-sdk resource-scoped authorization decorators @auth.on.threads, @auth.on.assistants, and @auth.on.crons ignore the actions argument and register the selected handler for every action on the resource. Because that wildcard resource handler is selected before broader fallback handlers, an authenticated user may bypass fallback action, ownership, or permission checks and read, update, or delete another user's resource. Only Python deployments using actions on the affected decorators are vulnerable, and a deployment remains protected when the selected handler independently enforces all required checks for every action it receives. This issue is fixed in version 0.4.4.",
    "evidence": "osv:CVE-2026-104873",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-104873",
      "aliases": [
        "CVE-2026-104873",
        "GHSA-fvww-7h3r-vfhp",
        "PYSEC-2026-4240"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/langchain-ai/langgraph",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9291ae864623fef39ad584abe19a13f5b2dd6e60"
                },
                {
                  "fixed": "d5f4b2aa960940effc8430165ab3604038e817af"
                },
                {
                  "fixed": "5a77be5e8bec1600ad0a865638d88c1368497559"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.1.45"
                      },
                      {
                        "fixed": "0.4.4"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5a77be5e8bec1600ad0a865638d88c1368497559"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d5f4b2aa960940effc8430165ab3604038e817af"
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                    "source": "REFERENCES_TAG",
                    "original_tag": "sdk==0.4.4"
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              }
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104873.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.981591066Z",
      "provider": "osv",
      "references": [
        "https://github.com/langchain-ai/langgraph/releases/tag/sdk==0.4.4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104873.json",
        "https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fvww-7h3r-vfhp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104873",
        "https://github.com/langchain-ai/langgraph/commit/5a77be5e8bec1600ad0a865638d88c1368497559"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104873.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104873",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514183,
  "published_at": "2026-10-02T20:06:07.09+00:00"
}