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.
CVE-2026-48776
This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.3% (20th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 9.1
- EG Score
- 9.1CRITICALmedium confidence
- EG Risk
- 41EG Risk 41/100
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computed (value × EchelonGraph’s weight)Severity91% × 45%The EG Score, 9.1 of 10.Exploitation0.3% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 20th
- KEV
- Not listed
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
June 17, 2026
Last Modified
June 26, 2026
Advisory Details (2)
Auto-updated Sep 16, 2026Unsafe URL path construction in LangGraph SDK · Advisory · langchain-ai/langgraph · GitHub
https://github.com/langchain-ai/langgraph/security/advisories/GHSA-w39p-vh2g-g8g5langgraph-sdk==0.3.15
Patch available: langchain-ai/langgraph sdk==0.3.15
https://github.com/langchain-ai/langgraph/releases/tag/sdk%3D%3D0.3.15Vendor Advisories for CVE-2026-48776(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Affected Packages
(2 across 1 ecosystem)
PyPI(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| langgraph | 0.0.10 ... 0.3.9 (175 versions) |
| — |
| langgraph-sdk | 0.1.0 ... 0.3.9 (96 versions) |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 26× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 145 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 45 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-11 19:43 UTCEG score recompute
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- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
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- 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 11th percentile
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- 2026-08-30 22:33 UTCEG score recompute
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 11th percentile
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- 2026-08-24 23:17 UTCEG score recompute
- 2026-08-23 09:01 UTCEG score recompute
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
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- 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-08-05 23:08 UTCEG score recompute
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- 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.2% · 12th percentile
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- 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-07-23 03:18 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-07-21 15:25 UTCEPSS rescoreEPSS 0.2% · 12th percentile
Related CVEs(same product + same CWE)
Same product
2 shownPyPI:langgraph-sdk · PyPI:langgraph
Same CWE
10 shownCWE-22 · CWE-863
Frequently asked(5)
What is CVE-2026-48776?
When was the CVE record for CVE-2026-48776 published?
Is CVE-2026-48776 actively exploited?
What is the CVSS score of CVE-2026-48776?
How do I remediate CVE-2026-48776?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48776
Is Your Infrastructure Affected by CVE-2026-48776?
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