# Tenjin Security Brief: etcd Handshake Deadline Advisory

> Tenjin Security Brief: etcd Handshake Deadline Advisory is a paid API for AI agents from tenjin.blog, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).

Retrieves the full paid-access text of a security brief about the etcd TLS handshake goroutine vulnerability and recommended mitigations

## Facts

- Endpoint: GET https://tenjin.blog/api/read/security-briefs/security-briefs-daily-etcd-added-a-handshake-deadline
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tenjin-security-brief-etcd-handshake-deadline-advisory-c55497fd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aGyYPNn5D4NV_wA4b_FbR

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tenjin-security-brief-etcd-handshake-deadline-advisory-c55497fd
```

Example prompt: Pull up the full Tenjin security brief about the etcd handshake deadline advisory — the one covering the high-severity TLS goroutine issue and recommended versions to upgrade to.

## When to prefer this

Use this endpoint when you need the complete, authoritative text of this specific etcd security brief from Tenjin and are prepared to pay the $0.10 USDC x402 micropayment. Prefer this over general web search when you want structured JSON output of the article, or when the brief may be paywalled elsewhere. Best suited for automated security pipelines ingesting curated advisories.

## Known failure modes

- Payment not completed or x402 challenge not satisfied — returns 402 Payment Required
- Invalid or mismatched handle/slug path parameters — returns 404 Not Found
- Article not yet published or taken down — returns 404
- Network or server error — returns 5xx
- Using handle 'latest' without a wallet address form — not payable and returns an error

## How this service works

GitHub published a high-severity etcd advisory for TLS listeners that could hold unbounded handshake goroutines; operators should move to 3.7.1, 3.6.14, or 3.5.33 and restrict who can reach the client gRPC port.

## Output

Returns the full article text of the security brief as a JSON object, detailing the etcd TLS handshake goroutine vulnerability, affected versions, recommended upgrade targets (3.7.1, 3.6.14, 3.5.33), and guidance on restricting access to the client gRPC port. Access is gated behind an x402 micropayment of $0.10 USDC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "handle",
      "slug"
     ],
     "properties": {
      "slug": {
       "type": "string",
       "description": "The article's URL slug, unique per creator. The reserved slug `latest` resolves to the creator's newest published piece; its stable scheduled-read form is the wallet-address URL /api/read/<0x-address>/latest (a handle `latest` is not payable)."
      },
      "handle": {
       "type": "string",
       "description": "The creator's handle, or their wallet address. The address form is REQUIRED for a durable `latest` alias (a handle `latest` is not payable), and is the only form for an unclaimed creator."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tenjin-security-brief-etcd-handshake-deadline-advisory-c55497fd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tenjin.blog](https://www.zero.xyz/host/tenjin.blog/llms.txt)