CVE-2026-104873: Langgraph sdk Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-fvww-7h3r-vfhp
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CWE-863
Published
Advisory Summary

CVE-2026-104873 is a HIGH remote code execution vulnerability (CWE-863: Incorrect Authorization) affecting Langgraph sdk libraries in the PyPI ecosystem. The issue involves langgraph sdk custom auth silently ignores actions= on resource decorators. Remediation is available by upgrading affected packages to version 0.4.4.

CVE-2026-104873 at a Glance

CVE Identifier CVE-2026-104873
GHSA Identifier GHSA-fvww-7h3r-vfhp
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Langgraph sdk
Package Ecosystem PyPI
Published Date
Last Updated

How to Fix CVE-2026-104873

To remediate this vulnerability, upgrade all affected Langgraph sdk dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

langgraph-sdk fixed: 0.4.4 
pip install langgraph-sdk>=0.4.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show langgraph-sdk

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-104873, inspect your installed packages using pip:

pip show langgraph-sdk

Analyze the terminal output to locate any version of Langgraph sdk in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.4), your application is affected.

Note: The pip show langgraph-sdk command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Langgraph sdk, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact _What kind of vulnerability is it? Who is impacted?_ `langgraph-sdk` incorrectly applies the `actions=` argument on resource-scoped authorization decorators, including `@auth.on.threads`, `@auth.on.assistants`, and `@auth.on.crons`. In affected versions, a decorator such as: ```python @auth.on.threads(actions=["create"]) async def allow_thread_create(ctx, value): return None ``` intended to register a handler for selected actions instead registers that handler for every action on the resource. Because the resource-wide handler is selected before broader fallback handlers, authorization checks implemented in those fallback handlers may not run. An authenticated user may therefore be able to perform actions the application intended to deny, such as reading, updating, or deleting another user's resource. Exploitability and impact depend on the affected handler's behavior: deployments remain protected if that handler independently enforces the necessary action, ownership, or permission checks for every request it receives. Only Python deployments using `actions=` on the affected resource-scoped decorators are affected. ### Patches 0.4.4 ### Workarounds No. ### References N/A

CVE-2026-104873 Affected Langgraph sdk Versions

1 component(s)
Fixed Versions:
0.4.4
Product / Package Ecosystem Affected Versions Fixed Version
langgraph-sdk
pypi/langgraph-sdk
PyPI
≥ 0.1.45
< 0.4.4
0.4.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fvww-7h3r-vfhp
NVD — CVE-2026-104873 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-104873
Security Fix Commit FIX COMMIT
https://github.com/langchain-ai/langgraph/commit/5a77be5e8bec1600ad0a865638d88c1368497559
Langgraph sdk Source Repository REPOSITORY
https://github.com/langchain-ai/langgraph
Langgraph sdk Release RELEASE
https://github.com/langchain-ai/langgraph/releases/tag/sdk==0.4.4

Frequently Asked Questions

What is CVE-2026-104873?
CVE-2026-104873 is a security vulnerability in Langgraph sdk involving LangGraph SDK custom auth silently ignores actions= on resource decorators under CWE-863: Incorrect Authorization.
Which Langgraph sdk versions are affected?
Affected versions include releases prior to 0.4.4 across affected packages: langgraph-sdk.
What version fixes CVE-2026-104873?
Upgrading to 0.4.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is langgraph-sdk affected?
Yes, langgraph-sdk is affected in releases prior to 0.4.4. Upgrade your dependency to 0.4.4 or later.
What CWE is associated with CVE-2026-104873?
CVE-2026-104873 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check PyPI dependencies for CVE-2026-104873?
Run the dependency tree command: 'pip show langgraph-sdk'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fvww-7h3r-vfhp",
  "modified" : "2026-10-05T22:49:35Z",
  "published" : "2026-10-05T22:49:35Z",
  "aliases" : [ "CVE-2026-104873" ],
  "summary" : "LangGraph SDK custom auth silently ignores actions= on resource decorators",
  "details" : "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n`langgraph-sdk` incorrectly applies the `actions=` argument on resource-scoped authorization decorators, including `@auth.on.threads`, `@auth.on.assistants`, and `@auth.on.crons`.\n\nIn affected versions, a decorator such as:\n\n```python\n@auth.on.threads(actions=[\"create\"])\nasync def allow_thread_create(ctx, value):\n    return None\n```\nintended to register a handler for selected actions instead registers that handler for every action on the resource. Because the resource-wide handler is selected before broader fallback handlers, authorization checks implemented in those fallback handlers may not run.\n\nAn authenticated user may therefore be able to perform actions the application intended to deny, such as reading, updating, or deleting another user's resource. Exploitability and impact depend on the affected handler's behavior: deployments remain protected if that handler independently enforces the necessary action, ownership, or permission checks for every request it receives.\n\nOnly Python deployments using `actions=` on the affected resource-scoped decorators are affected.\n\n### Patches\n\n0.4.4\n\n### Workarounds\n\nNo.\n\n### References\n\nN/A",
  "severity" : [ {
    "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" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "langgraph-sdk"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.1.45"
      }, {
        "fixed" : "0.4.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.4.3"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fvww-7h3r-vfhp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-104873"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/langchain-ai/langgraph/commit/5a77be5e8bec1600ad0a865638d88c1368497559"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/langchain-ai/langgraph"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/langchain-ai/langgraph/releases/tag/sdk==0.4.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-05T22:49:35Z",
    "nvd_published_at" : "2026-10-02T20:17:01Z"
  }
}