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CVE-2026-48776— LangGraph SDK has unsafe URL path construction

Quick assessment

Affected
langchain-ai langchain-ai
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

langchain-ai langchain-ai是langchain-ai公司的一个AI应用开发框架。 langchain-ai存在安全漏洞，该漏洞源于未清理调用方提供的标识符，导致不安全的URL路径构造，可能导致未经授权的访问、修改或删除资源。

CVSS 4.2 · Medium EPSS 0.29% · P20

Affected Version Matrix 2

VendorProduct Version RangeStatus
langchain-ai langchain-ai < 1.2.1 affected
langchain-ai langchain-sdk < 0.3.15 affected
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I. Basic Information for CVE-2026-48776

Vulnerability Information
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Vulnerability Title
LangGraph SDK has unsafe URL path construction
Source: CVE Program / CVE List V5
Vulnerability Description
LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and stream runs from Python applications. Versions 0.3.14 and prior have unsafe URL path construction through unsanitized caller-supplied identifier values used in HTTP request paths for resource operations. Without sanitization of those values, identifiers that contain characters with special meaning in URL paths could cause the resulting request to address a different resource (and potentially a different resource type) than the SDK method's call site indicates. In deployments where the SDK receives identifier values that originate from untrusted sources, this could result in unintended access, modification, or deletion of resources beyond the calling user's authorization scope. This issue is most consequential in deployments that forward end-user-supplied values directly into SDK identifier parameters without first validating them against an expected format (such as a UUID), and rely on URL-prefix-based authorization at an upstream layer (reverse proxy, edge gateway, WAF), where the authorization decision is made on the SDK call's intended path rather than on the final delivered request path. The issue has been fixed in version 0.3.15.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
langchain-ai 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
langchain-ai langchain-ai是langchain-ai公司的一个AI应用开发框架。 langchain-ai存在安全漏洞，该漏洞源于未清理调用方提供的标识符，导致不安全的URL路径构造，可能导致未经授权的访问、修改或删除资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langchain-ai < 1.2.1 -
langchain-ai langchain-sdk < 0.3.15 -

II. Public POCs for CVE-2026-48776

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III. Intelligence Information for CVE-2026-48776

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Vendor Advisories for CVE-2026-48776 (1)

Other References for CVE-2026-48776 (1)

IV. Related Vulnerabilities

Same vendor: langchain-ai
Same weakness: CWE-22

V. Comments for CVE-2026-48776

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