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9.3
CVE-2026-70558: Dinky allows unauthorized file uploads on default port
CVE-2026-70558 · published 29 days ago
Summary
A security issue in Dinky's file upload feature allows anyone who can access the default HTTP port (8888) to write arbitrary files as the Dinky service account. This can lead to unauthorized access and code execution. To mitigate this, ensure the HTTP port is not exposed to the internet and consider using authentication and access controls.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| datalinkdc | dinky | <= 1.2.5 |
Original advisory text
Dinky Unauthenticated Arbitrary File Write via /download/uploadFromRsByLocal Gated Only by Hardcoded Default Token
Dinky's POST /download/uploadFromRsByLocal handler passes the caller-supplied path parameter directly to new File(path) and file.transferTo(dest) with no path validation. The route is marked @SaIgnore and /download/** is excluded from the Sa-Token interceptor, so the only guard is a header equality check against a dinkyToken value whose default (efda1551-7958-4e0f-80a8-dfd107df3e38) is hardcoded in source and shipped to every deployment. Anyone who can reach Dinky's HTTP port (8888 by default) and supplies the hardcoded token can write arbitrary files as the Dinky service account. The default Docker image runs on 8888 with no proxy or authentication and chmod 777 on /opt/dinky, so the application's own classpath, launch scripts, and static assets are writable. Demonstrated impact: overwriting /opt/dinky/config/static/index.html served attacker JavaScript to admin browsers immediately, and writing /opt/dinky/org/dinky/Dinky.class executed attacker code as the Dinky service account at the next JVM start via a classpath-shadow launched by script/bin/auto.sh. Writes are uid 9999 (flink), not root, so /etc, /root, /home, and /usr are refused. Affects Dinky v1.2.5 (the current release) and the development branch, where the code is byte-identical.
References
- https://github.com/DataLinkDC/dinky
- https://github.com/DataLinkDC/dinky/issues/4566
- https://github.com/DataLinkDC/dinky/security/advisories/GHSA-2p66-w3p3-5226
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70558... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-70558 Vendor Advisory
Severity
9.3
Critical
CVSS 3.1: 9.8 (NVD)
CVSS 4.0: 9.3 (NVD)
CVSS 4.0: 9.9 (OSV)
Exploitation
EPSS <1%
Type
CWE-434Unrestricted File Upload
Timeline
Published6 Aug 2026
Updated3 Sep 2026
First seen6 Aug 2026
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