OctoPrint up to 1.11.5 timing discrepancy

Summaryinfo

A vulnerability was found in OctoPrint up to 1.11.5 and classified as problematic. This impacts an unknown function. Such manipulation leads to timing discrepancy. This vulnerability is listed as CVE-2026-23892. The attack must be carried out from within the local network. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in OctoPrint up to 1.11.5. It has been rated as problematic. Affected by this issue is an unknown code. The manipulation with an unknown input leads to a timing discrepancy vulnerability. Using CWE to declare the problem leads to CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-23892 since 01/16/2026. The exploitation is known to be difficult. The attack needs to be initiated within the local network. Additional levels of successful authentication are necessary for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 1.11.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 249fd80ab01bc4b7dabedff768230a0fb5d01a8c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• OctoPrint

Version

• 1.11.0
• 1.11.1
• 1.11.2
• 1.11.3
• 1.11.4
• 1.11.5

License

• open-source

Website

• Product: https://github.com/OctoPrint/OctoPrint/

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