What is CVE-2026-48776?

CVE-2026-48776 is a medium-severity vulnerability in Langchain Langgraph-sdk, classified under Path Traversal. CVSS score: 4.2/10. Published 2026-06-17.

How severe is CVE-2026-48776?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in Langchain Langgraph-sdk

CVE-2026-48776

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…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.002 (12.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Langchain Langgraph-sdk
Langchain-ai — versions < 1.2.1
Langchain-ai Langchain-sdk — versions < 0.3.15

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-48776?: CVE-2026-48776 is a medium-severity vulnerability in Langchain Langgraph-sdk, classified under Path Traversal. CVSS score: 4.2/10. Published 2026-06-17.
How severe is CVE-2026-48776?: Medium severity. CVSS v3 base score is 4.2 out of 10.