LangGraph SDK has unsafe URL path construction

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

EPSS

• CVE-2026-48776: 0.22% estimated exploitation activity in the next 30 days; percentile 12.17 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary langgraph-sdk constructs HTTP request paths for resource operations by interpolating caller-supplied identifier values into URL templates. 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…

Published by the source

25 Jun 2026, 18:32 UTC

Last modified by the source

21 Jul 2026, 15:03 UTC

Source last checked

26 Oct 2026, 13:49 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-w39p-vh2g-g8g5

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record PYSEC-2026-2194

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-w39p-vh2g-g8g5

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# Patch Next advisory brief: CVE-2026-48776

Advisory: LangGraph SDK has unsafe URL path construction
IDs: CVE-2026-48776, GHSA-w39p-vh2g-g8g5
Record: https://patchnext.com/advisories/cve-2026-48776 (revision 3, source checked 26 Oct 2026, 13:49 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: langgraph 0.3.15; langgraph-sdk 0.3.15. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI langgraph: affected < 0.3.15; fixed in 0.3.15
- PyPI langgraph-sdk: affected < 0.3.15; fixed in 0.3.15

## Suggested inspection (read-only)
- `python -m pip show langgraph`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show langgraph-sdk`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on langgraph, langgraph-sdk.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w39p-vh2g-g8g5 (OSV record GHSA-w39p-vh2g-g8g5 lists affected ranges: PyPI langgraph-sdk >=0 <0.3.15 (fixed))
- Verified: https://osv.dev/vulnerability/PYSEC-2026-2194 (OSV record PYSEC-2026-2194 lists affected ranges: PyPI langgraph >=0 <0.3.15 (fixed))
- Verified: https://github.com/advisories/GHSA-w39p-vh2g-g8g5 (GitHub-reviewed advisory GHSA-w39p-vh2g-g8g5 lists affected ranges: PyPI langgraph-sdk >=0 <0.3.15)

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