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ETK-2026-389

ETK-2026-389Zero's internal tracking ID, independent of the CVE number.

waiting for further signalsZero needs more public information before it can validate it.

GHSA-x8gv-g2g3-65fj ↗

no check availablenot proven exploitable
awaiting cvepublic pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).−19dkevAttacks confirmed in the real world.
go:github.com/siyuan-note/siyuan/kernel < 0.0.0-20260813142806-dd2778b70d02
fixed in 0.0.0-20260813142806-dd2778b70d02
ETK-2026-389, no cve assigned
pkg:golang/github.com/siyuan-note/siyuan/kernel
cvss8.2cna vendorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
18d 19h 25msince last run
28mAI analysisAnalysis: how long the AI spent reversing this signal.
timeline
0 = trigger signal
waiting for further signals−0.0dtrigger signal +0dpublic poc+0d
+5d
+10d
+15d
+20d

description

SiYuan kernel versions through 3.8.0 allow the agent HTTP request and web-fetch tools to bypass private-address filtering through DNS rebinding. An attacker who can influence an agent or MCP client to fetch an attacker-controlled domain may access internal services or cloud metadata reachable from the kernel host.

mitigation

Update github.com/siyuan-note/siyuan/kernel to version 0.0.0-20260813142806-dd2778b70d02 or later. Until updated, restrict access to the affected agent request and web-fetch tools and prevent them from fetching untrusted domains.

fixed in 0.0.0-20260813142806-dd2778b70d02

check
no
exploit
no
automationDeterministic: a check that runs on its own, the same request on every target. Contextual: an agentic technique that needs to be applied per target, for bugs that depend on contextual flows.
contextual
auth requiredWhether an attacker needs an account first, based on the CVSS vector's Privileges Required.
no
EPSSEstimate of the chance this CVE is exploited in the next 30 days. Refreshed daily.
–
agent run time
28m
cve.org record, t = 0The moment cve.org publishes the CVE in full.
not published yet
Δ to public pocExploit code has been published by someone. Source signals can also carry a PoC (Proof of Concept).
−19d
Δ to kevAttacks confirmed in the real world.
–

outcome

Contextual: an exploit technique exists, but no deterministic check could cover this one.

source signals

Public signals that triggered or updated the pipeline. These are inputs for the deltas above.

  1. 2026-10-02 23:17Z
    ghsa: trigger signal, started the run
    https://github.com/advisories/GHSA-x8gv-g2g3-65fj
  2. 2026-10-02 23:17Z

this entry in the feed

GET /api/v1/feed/ETK-2026-389

{
  "etk_id": "ETK-2026-389",
  "cve_id": null,
  "display_id": "ETK-2026-389",
  "ghsa_id": "GHSA-x8gv-g2g3-65fj",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "DNS-rebinding SSRF in SiYuan kernel agent tools",
  "summary": "SiYuan kernel versions through 3.8.0 allow the agent HTTP request and web-fetch tools to bypass private-address filtering through DNS rebinding. An attacker who can influence an agent or MCP client to fetch an attacker-controlled domain may access internal services or cloud metadata reachable from the kernel host.",
  "mitigation": "Update github.com/siyuan-note/siyuan/kernel to version 0.0.0-20260813142806-dd2778b70d02 or later. Until updated, restrict access to the affected agent request and web-fetch tools and prevent them from fetching untrusted domains.",
  "vendor": "go",
  "product": "go:github.com/siyuan-note/siyuan/kernel",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 0.0.0-20260813142806-dd2778b70d02"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "0.0.0-20260813142806-dd2778b70d02"
      ],
      "package_name": "github.com/siyuan-note/siyuan/kernel",
      "purl": "pkg:golang/github.com/siyuan-note/siyuan/kernel"
    }
  ],
  "cwes": null,
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 28.287600766666667,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-10-02T23:17:16+00:00",
      "days": -18.77753105383102,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T17:56:54.719268+00:00",
      "url": "https://github.com/advisories/GHSA-x8gv-g2g3-65fj"
    },
    "trigger_signal": {
      "at": "2026-10-02T23:17:16+00:00",
      "days": -18.77753105383102,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T17:56:54.719268+00:00",
      "url": "https://github.com/advisories/GHSA-x8gv-g2g3-65fj"
    }
  }
}

published 2026-10-02 23:54Z
last change 2026-10-21 17:47Z

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