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Vulnerabilities

Vulnerability · CVE-2026-25528

LangSmith Client SDKs provide SDK's for interacting with the LangSmith platform.

Published Feb 9, 2026 · catalog updated Feb 10, 2026 · LangSmith Client SDKs provide

Last checked Nov 8, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-25528. EPSS is 0.32%. Act only if a listed version of LangSmith Client SDKs provide is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (LangSmith Client SDKs provide).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.32%
Remediation
Version ranges on file
Affected products
vendor langchain-ai langsmith-sdk 0.4.10, <0.6.3

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor langchain-ai langsmith-sdk 0.4.10, <0.6.30.4.10, <0.6.3

How to fix CVE-2026-25528

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-25528. EPSS is 0.32%. Act only if a listed version of LangSmith Client SDKs provide is installed.

Which versions are affected?

Compare what you have installed with langchain-ai langsmith-sdk 0.4.10, <0.6.3 0.4.10, <0.6.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.32%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 9, 2026 · EUVD

    Detected

    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 S

  2. Feb 10, 2026 · EUVD

    Updated

    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 S

Sources

  • CVE.orgVulnerability recordCVE-2026-25528

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-25528

    30-day exploitation probability 0.32%

    first.org
  • EUVDVulnerability recordEUVD-2026-6847

    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, ca

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 8, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 8, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 3, 2026