CVE-2026-23892 OctoPrint has Timing Side-Channel Vulnerability in API Key Authentication
Attackers can potentially extract API keys via timing side-channels in OctoPrint, allowing unauthorized access to 3D printer controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23892?
CVE-2026-23892 is a medium-severity vulnerability in OctoPrint, published on 27 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
OctoPrint provides a web interface for controlling consumer 3D printers. OctoPrint versions up to and including 1.11.5 are affected by a (theoretical) timing attack vulnerability that allows API key extraction over the network. Due to using character based comparison that short-circuits on the first mismatched character during API key validation, rather than a cryptographical method with static runtime regardless of the point of mismatch, an attacker with network based access to an affected OctoPrint could extract API keys valid on the instance by measuring the response times of the denied access responses and guess an API key character by character. The vulnerability is patched in version 1.11.6. The likelihood of this attack actually working is highly dependent on the network's latency, noise and similar parameters. An actual proof of concept was not achieved so far. Still, as always administrators are advised to not expose their OctoPrint instance on hostile networks, especially not on the public Internet.
Weakness: CWE-208
Which versions are affected by CVE-2026-23892?
3 open source packages ship an affected version, including octoprint and OctoPrint. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
octoprint PyPI | All versions | 1.11.6 |
octoprint PyPI | All versions | 1.11.6 |
OctoPrint PyPI | All versions | 1.11.6 |
Products include Octoprint Octoprint.
How do I fix CVE-2026-23892?
Upgrade octoprint to 1.11.6 or later.
Is CVE-2026-23892 being exploited?
There is no known exploitation of CVE-2026-23892 in the wild and no public exploit code.
Other vulnerabilities in OctoPrint
- CVE-2018-16710 Information disclosure in n/a
- CVE-2025-58180 OctoPrint is Vulnerable to RCE Attacks via Unsanitized Filename in File Upload
- CVE-2022-1430 Cross-site Scripting (XSS) - DOM in octoprint/octoprint
- CVE-2022-1432 Cross-site Scripting (XSS) - Generic in octoprint/octoprint
- CVE-2024-32977 OctoPrint Authentication Bypass via X-Forwarded-For Header when autologinLocal is enabled
Sources
Also known as GHSA-xg4x-w2j3-57h6, PYSEC-2026-1716.