LangsmithApplication · Langchain
CVE-2026-25750
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedLangchain Helm Charts are Helm charts for deploying Langchain applications on Kubernetes. Prior to langchain-ai/helm version 0.12.71, a URL parameter injection vulnerability existed in LangSmith Studio that could allow unauthorized access to user accounts through stolen authentication tokens. The vulnerability affected both LangSmith Cloud and self-hosted deployments. Authenticated LangSmith users who clicked on a specially crafted malicious link would have their bearer token, user ID, and workspace ID transmitted to an attacker-controlled server. With this stolen token, an attacker could impersonate the victim and access any LangSmith resources or perform any actions the user was authorized to perform within their workspace. The attack required social engineering (phishing, malicious links in emails or chat applications) to convince users to click the crafted URL. The stolen tokens expired after 5 minutes, though repeated attacks against the same user were possible if they could be convinced to click malicious links multiple times. The fix in version 0.12.71 implements validation requiring user-defined allowed origins for the baseUrl parameter, preventing tokens from being sent to unauthorized servers. No known workarounds are available. Self-hosted customers must upgrade to the patched version.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis is a URL parameter injection vulnerability in LangSmith Studio (part of Langchain Helm Charts) affecting versions prior to 0.12.71. Attackers can craft malicious URLs containing attacker-controlled baseUrl parameters that, when clicked by authenticated users, cause the browser to transmit the user's bearer token, user ID, and workspace ID to the attacker's server. The fix in version 0.12.71 adds validation requiring user-defined allowed origins for the baseUrl parameter, preventing token exfiltration to unauthorized domains.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
LangsmithApplication
< 0.12.71CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify LangSmith Helm chart versionRun 'helm list -n <namespace>' or check your deployed Helm release version for langchain-ai/langsmithAffected if The installed Helm chart version is less than 0.12.71
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Check LangSmith image versionInspect the deployed pods or container images running LangSmith Studio and note the version tagAffected if The running LangSmith image version is less than 0.12.71
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Inspect baseUrl origin validation configurationReview Helm values.yaml or environment variables for user-defined allowed origins configuration related to the baseUrl parameterAffected if No user-defined allowed origins are configured or baseUrl accepts arbitrary origins
You are affected if your LangSmith version is below 0.12.71 OR if you are on 0.12.71+ but have not configured user-defined allowed origins for the baseUrl parameter.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped0.12.71
Upgrade langchain-ai/helm charts to version 0.12.71 or later and configure user-defined allowed origins for the baseUrl parameter to prevent token theft via malicious links.
langchain-ai/helm version 0.12.71
- Upgrade the Langchain Helm chart to version 0.12.71 or later by updating the Helm repository and running 'helm upgrade'
- After upgrading, configure user-defined allowed origins for the baseUrl parameter in the LangSmith deployment configuration to prevent tokens from being sent to unauthorized servers
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Langsmith
Scoped from the published advisory
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.
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Free · runs locallyCheck whether your project pulls in CVE-2026-25750 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-25750 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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