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Security audit

Langsearch

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed LangSearch API integration that sends search queries and the LangSearch API key only to the documented LangSearch API endpoint.

Install only if you are comfortable sending your search queries, reranking documents, and LangSearch API key to LangSearch over HTTPS. Keep the API key in an environment variable and avoid using the skill for confidential queries unless LangSearch's data handling terms meet your needs.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Taint TrackingDirect Taint Flow, Variable-Mediated Taint Flow, Credential Exfiltration Chain
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (27)

Tainted flow: 'headers' from os.getenv (line 47, credential/environment) → requests.post (network output)

Critical
Category
Data Flow
Content
for attempt in range(max_retries):
        try:
            response = requests.post(url, headers=headers, json=payload, timeout=30)

            if response.status_code == 200:
                return response.json()
Confidence
90% confidence
Finding
Credentials or environment variables flow to a network sink. This is a high-confidence indicator of credential exfiltration.

Lp3

Medium
Category
MCP Least Privilege
Confidence
94% confidence
Finding
The skill performs network requests and uses an environment credential, but it does not declare an explicit tool scope such as permissions or allowed-tools. This creates a policy and review gap: an agent may be able to invoke broader capabilities than the skill contract clearly communicates, increasing the chance of unintended credential use or outbound requests.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
"summary": True
}

response = requests.post(
    "https://api.langsearch.com/v1/web-search",
    headers=headers,
    json=payload
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
Or using cURL:

```bash
curl -X POST https://api.langsearch.com/v1/web-search \
  -H "Authorization: Bearer $LANGSEARCH_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
]

# Rerank for better relevance
rerank_response = requests.post(
    "https://api.langsearch.com/v1/rerank",
    headers=headers,
    json={
Confidence
70% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
if freshness:
        payload["freshness"] = freshness

    url = "https://api.langsearch.com/v1/web-search"

    for attempt in range(max_retries):
        try:
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Static analysis

No suspicious patterns detected.