Timing Attack Vulnerability in OctoPrint Affects 3D Printer API Key Security
CVE-2026-23892

6MEDIUM

Key Information:

Vendor

Octoprint

Status
Octoprint
Vendor
CVE Published:
27 January 2026

What is CVE-2026-23892?

OctoPrint, a widely used web interface for managing 3D printers, is vulnerable to a timing attack that could potentially allow an attacker to extract API keys. This vulnerability arises from the method of comparing characters during API key validation, which short-circuits on the first mismatch. Consequently, with network access to an affected instance, attackers can exploit response time variations to guess API keys one character at a time. The flaw affects OctoPrint versions up to 1.11.5 and has been addressed in version 1.11.6. Administrators are advised to secure their OctoPrint instances against access from untrusted networks, particularly the public Internet, to mitigate risks.

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Affected Version(s)

OctoPrint < 1.11.6

References

https://github.com/OctoPrint/OctoPrint/security/advisorie...
x_refsource_CONFIRM
https://github.com/OctoPrint/OctoPrint/commit/249fd80ab01...
x_refsource_MISC
https://github.com/OctoPrint/OctoPrint/releases/tag/1.11.6
x_refsource_MISC

CVSS V4

Score:
6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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