CVE-2026-48776Network attack vector

Unauthorized resource access via unencoded identifiers

Published Jun 16, 2026 · Updated Jun 16, 2026

Path traversal in LangChain LangGraph SDK before 0.3.15 allows remote authenticated users to access or alter resources via crafted identifiers. Resource-operation methods interpolate caller-supplied identifiers directly into URL templates without encoding path-segment metacharacters. Exploitation requires unvalidated identifiers from an untrusted source and upstream prefix-based authorization, enabling cross-resource reads, changes, or deletion.

CVSS severity4.2
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in LangChain LangGraph SDK before 0.3.15 allows remote authenticated users to access or alter resources via crafted identifiers. Resource-operation methods interpolate caller-supplied identifiers directly into URL templates without encoding path-segment metacharacters. Exploitation requires unvalidated identifiers from an untrusted source and upstream prefix-based authorization, enabling cross-resource reads, changes, or deletion.

The record

CVE
CVE-2026-48776
Published
Jun 16, 2026
Updated
Jun 16, 2026
Vendor
LangChain
Product
LangGraph SDK
Classifications
CWE-863, CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.3.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LangChain · LangGraph SDKversion=< 0.3.15

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
4.2GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo