Vulnerability-Lookup

GHSA-3298-56P6-RPW2

Vulnerability from github – Published: 2026-03-30 18:30 – Updated: 2026-04-10 17:29

Summary

OpenClaw has incomplete Fix for CVE-2026-27486: Unvalidated SIGKILL in `!stop` Chat Command via `shell-utils.ts`

Details

Fixed in OpenClaw 2026.3.24, the current shipping release.

Advisory Details

Title: Incomplete Fix for CVE-2026-27486: Unvalidated SIGKILL in !stop Chat Command via shell-utils.ts

Description:

Summary

The !stop (and /bash stop) chat command kills background bash processes using SIGKILL directly, without first sending SIGTERM to allow graceful shutdown. This is because bash-command.ts imports killProcessTree() from src/agents/shell-utils.ts, which still contains the pre-CVE-2026-27486 aggressive kill logic, rather than from the patched src/process/kill-tree.ts.

Details

CVE-2026-27486 fixed unsafe process termination by introducing a graceful shutdown sequence in src/process/kill-tree.ts — sending SIGTERM first, waiting a configurable grace period (default 3 seconds), then escalating to SIGKILL only if the process is still alive.

However, an identical copy of the unpatched killProcessTree function remains in src/agents/shell-utils.ts (lines 170–192). This function sends SIGKILL immediately with no SIGTERM:

// src/agents/shell-utils.ts:170-192
export function killProcessTree(pid: number): void {
  // ... Windows handling ...
  try {
    process.kill(-pid, "SIGKILL"); // Immediate hard kill, no SIGTERM
  } catch {
    try {
      process.kill(pid, "SIGKILL");
    } catch {
      // process already dead
    }
  }
}

The !stop chat command handler in src/auto-reply/reply/bash-command.ts imports and calls this vulnerable version at line 302:

// src/auto-reply/reply/bash-command.ts:5
import { killProcessTree } from "../../agents/shell-utils.js";

// src/auto-reply/reply/bash-command.ts:300-304
const pid = running.pid ?? running.child?.pid;
if (pid) {
  killProcessTree(pid);  // Calls the UNPATCHED version
}
markExited(running, null, "SIGKILL", "failed");

Compare this to the patched version in src/process/kill-tree.ts:

// src/process/kill-tree.ts:46-78
function killProcessTreeUnix(pid: number, graceMs: number): void {
  // Step 1: Try graceful SIGTERM to process group
  try {
    process.kill(-pid, "SIGTERM");
  } catch { /* ... */ }

  // Step 2: Wait grace period, then SIGKILL if still alive
  setTimeout(() => {
    if (isProcessAlive(-pid)) {
      try { process.kill(-pid, "SIGKILL"); } catch { /* ... */ }
    }
  }, graceMs).unref();
}

PoC

This PoC demonstrates the difference between the vulnerable and patched code paths inside a running OpenClaw Gateway container.

Setup:

# Build and start the gateway container
cd CVE-2026-27486-variant-exp/
docker compose up -d
sleep 5

Exploit (vulnerable killProcessTree from shell-utils.ts):

The following script is injected into the container and executed. It starts a bash process that traps SIGTERM for graceful shutdown, then kills it using the same code path as !stop:

// exploit_sigkill.cjs — replicates src/agents/shell-utils.ts:183-190
const { spawn } = require('child_process');
const fs = require('fs');

try { fs.unlinkSync('/tmp/graceful_shutdown.txt'); } catch {}

const child = spawn('/bin/bash', ['-c',
  'trap \'echo GRACEFUL_SHUTDOWN > /tmp/graceful_shutdown.txt; exit 0\' SIGTERM; while true; do sleep 1; done'
], { detached: true, stdio: 'ignore' });
child.unref();

setTimeout(() => {
  // VULNERABLE: same as shell-utils.ts — SIGKILL only
  try { process.kill(-child.pid, 'SIGKILL'); } catch {
    try { process.kill(child.pid, 'SIGKILL'); } catch {}
  }
  setTimeout(() => {
    if (fs.existsSync('/tmp/graceful_shutdown.txt')) {
      console.log('[BLOCKED] SIGTERM was received.');
      process.exit(1);
    } else {
      console.log('[EXPLOITED] SIGKILL sent directly — SIGTERM never delivered.');
      process.exit(0);
    }
  }, 2000);
}, 1000);

Run:

python3 poc_exploit.py

Log of Evidence

Exploit output (SIGKILL only, no graceful shutdown):

[*] Running exploit (vulnerable killProcessTree from shell-utils.ts)...
[*] Victim PID: 78
[*] Calling vulnerable killProcessTree (SIGKILL only, no SIGTERM)...
[EXPLOITED] SIGKILL sent directly — SIGTERM never delivered.
[EXPLOITED] Graceful shutdown handler was NEVER invoked.

[SUCCESS] CVE-2026-27486 variant confirmed:
  killProcessTree() in shell-utils.ts sends immediate SIGKILL,
  bypassing the graceful shutdown fix in process/kill-tree.ts.

Control output (SIGTERM first, graceful shutdown works):

[*] Running control (patched killProcessTree from process/kill-tree.ts)...
[*] Victim PID: 93
[*] Calling patched killProcessTree (SIGTERM first, then SIGKILL after grace)...
[NORMAL] SIGTERM received — graceful shutdown completed. Flag: GRACEFUL_SHUTDOWN

[NORMAL] Control confirmed: patched killProcessTree sends SIGTERM first,
         allowing graceful shutdown before escalating to SIGKILL.

Impact

When !stop is used, background processes are killed instantly via SIGKILL with no chance to perform cleanup. This can result in:

Data corruption: processes writing to files or databases are interrupted mid-write
Resource leaks: temporary files, lock files, and network connections are not properly released
Security-sensitive cleanup skipped: operations like erasing in-memory secrets or completing audit logs are bypassed

This is the same class of impact that CVE-2026-27486 was filed for — the fix simply missed the shell-utils.ts copy of the function.

Affected products

Ecosystem: npm
Package name: openclaw
Affected versions: <= 2026.3.14
Patched versions:

Severity

Severity: Medium
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Weaknesses

CWE: CWE-404: Improper Resource Shutdown or Release

Occurrences

Permalink	Description
https://github.com/moltbot/moltbot/blob/f2849c2417/src/agents/shell-utils.ts#L170-L192	The vulnerable `killProcessTree` function that sends immediate `SIGKILL` without `SIGTERM`.
https://github.com/moltbot/moltbot/blob/f2849c2417/src/auto-reply/reply/bash-command.ts#L5	Import statement pulling the vulnerable `killProcessTree` from `shell-utils.ts` instead of the patched `kill-tree.ts`.
https://github.com/moltbot/moltbot/blob/f2849c2417/src/auto-reply/reply/bash-command.ts#L300-L304	The `!stop` handler calling the vulnerable `killProcessTree(pid)`.
https://github.com/moltbot/moltbot/blob/f2849c2417/src/process/kill-tree.ts#L46-L78	The patched `killProcessTreeUnix` with graceful `SIGTERM` → grace period → `SIGKILL` sequence (for reference).

Severity ?

6.1 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "openclaw"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.3.24"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-35667"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-404"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-30T18:30:01Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "\u003e Fixed in OpenClaw 2026.3.24, the current shipping release.\n\n### Advisory Details\n**Title**: Incomplete Fix for CVE-2026-27486: Unvalidated SIGKILL in `!stop` Chat Command via `shell-utils.ts`\n\n**Description**:\n### Summary\nThe `!stop` (and `/bash stop`) chat command kills background bash processes using `SIGKILL` directly, without first sending `SIGTERM` to allow graceful shutdown. This is because `bash-command.ts` imports `killProcessTree()` from `src/agents/shell-utils.ts`, which still contains the pre-CVE-2026-27486 aggressive kill logic, rather than from the patched `src/process/kill-tree.ts`.\n\n### Details\nCVE-2026-27486 fixed unsafe process termination by introducing a graceful shutdown sequence in `src/process/kill-tree.ts` \u2014 sending `SIGTERM` first, waiting a configurable grace period (default 3 seconds), then escalating to `SIGKILL` only if the process is still alive.\n\nHowever, an identical copy of the **unpatched** `killProcessTree` function remains in `src/agents/shell-utils.ts` (lines 170\u2013192). This function sends `SIGKILL` immediately with no `SIGTERM`:\n\n```typescript\n// src/agents/shell-utils.ts:170-192\nexport function killProcessTree(pid: number): void {\n  // ... Windows handling ...\n  try {\n    process.kill(-pid, \"SIGKILL\"); // Immediate hard kill, no SIGTERM\n  } catch {\n    try {\n      process.kill(pid, \"SIGKILL\");\n    } catch {\n      // process already dead\n    }\n  }\n}\n```\n\nThe `!stop` chat command handler in `src/auto-reply/reply/bash-command.ts` imports and calls this vulnerable version at line 302:\n\n```typescript\n// src/auto-reply/reply/bash-command.ts:5\nimport { killProcessTree } from \"../../agents/shell-utils.js\";\n\n// src/auto-reply/reply/bash-command.ts:300-304\nconst pid = running.pid ?? running.child?.pid;\nif (pid) {\n  killProcessTree(pid);  // Calls the UNPATCHED version\n}\nmarkExited(running, null, \"SIGKILL\", \"failed\");\n```\n\nCompare this to the patched version in `src/process/kill-tree.ts`:\n\n```typescript\n// src/process/kill-tree.ts:46-78\nfunction killProcessTreeUnix(pid: number, graceMs: number): void {\n  // Step 1: Try graceful SIGTERM to process group\n  try {\n    process.kill(-pid, \"SIGTERM\");\n  } catch { /* ... */ }\n\n  // Step 2: Wait grace period, then SIGKILL if still alive\n  setTimeout(() =\u003e {\n    if (isProcessAlive(-pid)) {\n      try { process.kill(-pid, \"SIGKILL\"); } catch { /* ... */ }\n    }\n  }, graceMs).unref();\n}\n```\n\n### PoC\n\nThis PoC demonstrates the difference between the vulnerable and patched code paths inside a running OpenClaw Gateway container.\n\n**Setup:**\n```bash\n# Build and start the gateway container\ncd CVE-2026-27486-variant-exp/\ndocker compose up -d\nsleep 5\n```\n\n**Exploit (vulnerable `killProcessTree` from `shell-utils.ts`):**\n\nThe following script is injected into the container and executed. It starts a bash process that traps `SIGTERM` for graceful shutdown, then kills it using the same code path as `!stop`:\n\n```javascript\n// exploit_sigkill.cjs \u2014 replicates src/agents/shell-utils.ts:183-190\nconst { spawn } = require(\u0027child_process\u0027);\nconst fs = require(\u0027fs\u0027);\n\ntry { fs.unlinkSync(\u0027/tmp/graceful_shutdown.txt\u0027); } catch {}\n\nconst child = spawn(\u0027/bin/bash\u0027, [\u0027-c\u0027,\n  \u0027trap \\\u0027echo GRACEFUL_SHUTDOWN \u003e /tmp/graceful_shutdown.txt; exit 0\\\u0027 SIGTERM; while true; do sleep 1; done\u0027\n], { detached: true, stdio: \u0027ignore\u0027 });\nchild.unref();\n\nsetTimeout(() =\u003e {\n  // VULNERABLE: same as shell-utils.ts \u2014 SIGKILL only\n  try { process.kill(-child.pid, \u0027SIGKILL\u0027); } catch {\n    try { process.kill(child.pid, \u0027SIGKILL\u0027); } catch {}\n  }\n  setTimeout(() =\u003e {\n    if (fs.existsSync(\u0027/tmp/graceful_shutdown.txt\u0027)) {\n      console.log(\u0027[BLOCKED] SIGTERM was received.\u0027);\n      process.exit(1);\n    } else {\n      console.log(\u0027[EXPLOITED] SIGKILL sent directly \u2014 SIGTERM never delivered.\u0027);\n      process.exit(0);\n    }\n  }, 2000);\n}, 1000);\n```\n\n**Run:**\n```bash\npython3 poc_exploit.py\n```\n\n### Log of Evidence\n\n**Exploit output (SIGKILL only, no graceful shutdown):**\n```\n[*] Running exploit (vulnerable killProcessTree from shell-utils.ts)...\n[*] Victim PID: 78\n[*] Calling vulnerable killProcessTree (SIGKILL only, no SIGTERM)...\n[EXPLOITED] SIGKILL sent directly \u2014 SIGTERM never delivered.\n[EXPLOITED] Graceful shutdown handler was NEVER invoked.\n\n[SUCCESS] CVE-2026-27486 variant confirmed:\n  killProcessTree() in shell-utils.ts sends immediate SIGKILL,\n  bypassing the graceful shutdown fix in process/kill-tree.ts.\n```\n\n**Control output (SIGTERM first, graceful shutdown works):**\n```\n[*] Running control (patched killProcessTree from process/kill-tree.ts)...\n[*] Victim PID: 93\n[*] Calling patched killProcessTree (SIGTERM first, then SIGKILL after grace)...\n[NORMAL] SIGTERM received \u2014 graceful shutdown completed. Flag: GRACEFUL_SHUTDOWN\n\n[NORMAL] Control confirmed: patched killProcessTree sends SIGTERM first,\n         allowing graceful shutdown before escalating to SIGKILL.\n```\n\n### Impact\nWhen `!stop` is used, background processes are killed instantly via `SIGKILL` with no chance to perform cleanup. This can result in:\n\n- **Data corruption**: processes writing to files or databases are interrupted mid-write\n- **Resource leaks**: temporary files, lock files, and network connections are not properly released\n- **Security-sensitive cleanup skipped**: operations like erasing in-memory secrets or completing audit logs are bypassed\n\nThis is the same class of impact that CVE-2026-27486 was filed for \u2014 the fix simply missed the `shell-utils.ts` copy of the function.\n\n### Affected products\n- **Ecosystem**: npm\n- **Package name**: openclaw\n- **Affected versions**: \u003c= 2026.3.14\n- **Patched versions**: \u003cNone\u003e\n\n### Severity\n- **Severity**: Medium\n- **Vector string**: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H\n\n### Weaknesses\n- **CWE**: CWE-404: Improper Resource Shutdown or Release\n\n### Occurrences\n\n| Permalink | Description |\n| :--- | :--- |\n| [https://github.com/moltbot/moltbot/blob/f2849c2417/src/agents/shell-utils.ts#L170-L192](https://github.com/moltbot/moltbot/blob/f2849c2417/src/agents/shell-utils.ts#L170-L192) | The vulnerable `killProcessTree` function that sends immediate `SIGKILL` without `SIGTERM`. |\n| [https://github.com/moltbot/moltbot/blob/f2849c2417/src/auto-reply/reply/bash-command.ts#L5](https://github.com/moltbot/moltbot/blob/f2849c2417/src/auto-reply/reply/bash-command.ts#L5) | Import statement pulling the vulnerable `killProcessTree` from `shell-utils.ts` instead of the patched `kill-tree.ts`. |\n| [https://github.com/moltbot/moltbot/blob/f2849c2417/src/auto-reply/reply/bash-command.ts#L300-L304](https://github.com/moltbot/moltbot/blob/f2849c2417/src/auto-reply/reply/bash-command.ts#L300-L304) | The `!stop` handler calling the vulnerable `killProcessTree(pid)`. |\n| [https://github.com/moltbot/moltbot/blob/f2849c2417/src/process/kill-tree.ts#L46-L78](https://github.com/moltbot/moltbot/blob/f2849c2417/src/process/kill-tree.ts#L46-L78) | The **patched** `killProcessTreeUnix` with graceful `SIGTERM` \u2192 grace period \u2192 `SIGKILL` sequence (for reference). |",
  "id": "GHSA-3298-56p6-rpw2",
  "modified": "2026-04-10T17:29:20Z",
  "published": "2026-03-30T18:30:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-3298-56p6-rpw2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-jfv4-h8mc-jcp8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openclaw/openclaw"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenClaw has incomplete Fix for CVE-2026-27486: Unvalidated SIGKILL in `!stop` Chat Command via `shell-utils.ts`"
}

CVE-2026-35667 (GCVE-0-2026-35667)

Vulnerability from cvelistv5 – Published: 2026-04-10 16:03 – Updated: 2026-04-10 20:17 X_Open Source

Title

OpenClaw < 2026.3.24 - Improper Process Termination via Unpatched killProcessTree in shell-utils.ts

Summary

OpenClaw before 2026.3.24 contains an incomplete fix for CVE-2026-27486 where the !stop chat command uses an unpatched killProcessTree function from shell-utils.ts that sends SIGKILL immediately without graceful SIGTERM shutdown. Attackers can trigger process termination via the !stop command, causing data corruption, resource leaks, and skipped security-sensitive cleanup operations.

Severity ?

6.9 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

6.1 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CWE

CWE-404 - Improper Resource Shutdown or Release

Assigner

VulnCheck

References

URL

Tags

	https://github.com/openclaw/openclaw/security/adv…	third-party-advisory
	https://www.vulncheck.com/advisories/openclaw-imp…	third-party-advisory

Impacted products

	Vendor	Product	Version
	OpenClaw	OpenClaw	Affected: 0 , < 2026.3.24 (semver) Unaffected: 2026.3.24 (semver)

Date Public ?

2026-03-27 00:00

Credits

Edward-x (@YLChen-007)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-3298-56P6-RPW2

Advisory Details

Summary

Details

PoC

Log of Evidence

Impact

Affected products

Severity

Weaknesses

Occurrences

CVE-2026-35667 (GCVE-0-2026-35667)

Tags

Sightings

Nomenclature