Path Traversal in zrok (CVE-2026-45568)
Summary
Path traversal in zrok (CVE-2026-45568). Confidential information can be exposed externally. Exploitable via ProxyShare.
Original description
The description as published by the source.
Summary
Alice exposes a Python SDK ProxyShare with a fixed target URL. Bob sends a request to the share with an absolute URL in the path. The Flask handler passes that path to urllib.parse.urljoin, which replaces Alice's configured target host with Bob's host and returns the server-side response to Bob.
Details
The Python SDK proxy route accepts every path under the share:
@app.route('/', defaults={'path': ''}, methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'])
@app.route('/', methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'])
def proxy(path):
It constructs the outbound URL with urljoin and then sends the request:
url = urllib.parse.urljoin(self.target, path)
resp = requests.request(
method=request.method,
url=url,
headers={key: value for (key, value) in request.headers
if key.lower() not in HOP_BY_HOP_HEADERS},
data=request.get_data(),
cookies=request.cookies,
allow_redirects=False,
stream=True,
verify=self.verify_ssl
)
When path is [http://127.0.0.1:19190/metadata](http://127.0.0.1:19190/metadata%60), urljoin(self.target, path) returns [http://127.0.0.1:19190/metadata](http://127.0.0.1:19190/metadata%60). The proxy sends the request to Bob's chosen URL rather than Alice's target.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-45568 has been found in zrok.
Attackers can target a specific entry point like ProxyShare over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 9.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "zrok CVE-2026-45568" on the vendor's site.
CVE-2026-45568 (zrok) — CWE-22 / CVSS v3 9.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: ProxyShare / urllib.parse.urljoin / urljoin / path
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Path traversal (CWE-22) exists in zrok. Attackers reach the vulnerable code path via ProxyShare without authentication.
Check the vendor advisory for the affected versions of zrok. Attack surface: ProxyShare / urllib.parse.urljoin / urljoin / path.
Severity: Critical (CVSS 9.1/10). Confidential information can be exposed externally.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'zrok' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'zrok' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
zrokを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- package pypi.org
- patch security-advisories@github.com
- web github.com
- web security-advisories@github.com