Unrated

Authorization bypass in LangGraph Server run creation

IdentifiersCVE-2026-55236CWE-863

CVE-2026-55236 is an authorization flaw in langgraph-api affecting LangGraph Server run creation. Incomplete assistant authorization allows a user to reference another user's private assistant during run creation. When the authorization logic does not consistently enforce owner-based filtering across assistant read, search, and run or cron creation paths, the server may return sensitive assistant metadata, configuration, and context in the run-creation response. The issue stems from inconsistent authorization coverage between related assistant access paths rather than a memory-safety defect or input-parsing flaw.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can disclose another user's private assistant metadata, configuration, and contextual information. It can also allow unauthorized creation of runs using another user's private assistant configuration, potentially exposing sensitive workflow details and enabling misuse of private assistant resources or logic.

Mitigation

If you can’t patch tonight, do this now.

As an interim measure, register an assistants.read authorization handler, or a global handler that covers assistant events, and ensure it returns an owner-style filter consistently applied across assistant read, search, and run or cron creation flows. Validate parity between these authorization paths and move any logic that depended on assistants.read metadata during run or cron creation into the corresponding create handlers where appropriate.

Remediation

Patch, then assume compromise.

Upgrade langgraph-api to version 0.10.0 or later, which contains the authorization fix. Review custom authorization handlers to ensure owner-based filtering is enforced consistently across assistant read, assistant search, and run or cron creation paths. Where deployments rely on assistants.search during run creation, implement equivalent authorization controls for assistants.read and related execution paths.

PUBLIC EXPLOITS

Exploits

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VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

LangchainLanggraph-Apiapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

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0 SOURCESView more in app

No public activity observed for this vulnerability.

What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

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Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity