CVE-2026-48776: LangGraph Python SDK is used to connect to running LangGraph API servers, manage assistants, threads and strea

Routine

MEDIUM 4.2UPGRADE

CVE-2026-48776 is a medium-severity flaw (CVSS 4.2) affecting langgraph-sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.2 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-22, CWE-863
Published	2026-06-17
Last modified	2026-06-26

Publisher (CNA): GitHub, Inc. · Vendor: langchain

Last updated 2026-06-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 10:55 UTCPublished CVE record published
2026-06-26 15:26 UTCUpdated Record last modified

langchain langgraph-sdk UPGRADE

Affected: < 0.3.15

Fixed in: 0.3.15

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show langgraph-sdk

2. UPGRADE to 0.3.15

pip install --upgrade "langgraph-sdk>=0.3.15"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48776?

langgraph-sdk: upgrade to 0.3.15. Exact commands for each OS are on this page.

Is CVE-2026-48776 being exploited?

CVE-2026-48776 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48776 affect?

CVE-2026-48776 affects langgraph-sdk. Severity is medium (CVSS 4.2). 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 i

How urgent is CVE-2026-48776?

Priority 18/100. No elevated risk signals yet.

Software pages

Python vulnerabilities · OpenAI and LLM tools vulnerabilities

References

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