Read the docs
TI-2026-19250 Aliases CVE-2026-23892GHSA-xg4x-w2j3-57h6

OctoPrint has Timing Side-Channel Vulnerability in API Key Authentication

Priority LOW 27CWE-208Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-208.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00433 37th percentileScored 2026-11-07
Fix Fixed OctoPrint (OctoPrint): 1.11.6OctoPrint (PyPI): 1.11.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OctoPrintOctoPrintbefore 1.11.61.11.6Patch availableCNA
—OctoPrint (PyPI)before 1.11.61.11.6Patch availableGHSA-xg4x-w2j3-57h6
  • OctoPrint VendorOctoPrint Affected before 1.11.6 Fixed in 1.11.6 Patch available CNA
  • OctoPrint (PyPI) Vendor— Affected before 1.11.6 Fixed in 1.11.6 Patch available GHSA-xg4x-w2j3-57h6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:octoprint:octoprint:*:*:*:*:*:*:*:*before 1.11.6VulnerableOctoPrint
  • cpe:2.3:a:octoprint:octoprint:*:*:*:*:*:*:*:* Versions before 1.11.6 Vulnerable ·OctoPrint

Remediation

  • Fix · CNA OctoPrint (OctoPrint) Fixed in 1.11.6
  • Fix · GHSA-xg4x-w2j3-57h6 OctoPrint (PyPI) Fixed in 1.11.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23892
  2. 2026-10-03 Alias added: GHSA-xg4x-w2j3-57h6

References

Patch 1

Advisory 2

Other 2

  • TI-2022-02830 Improper Privilege Management in octoprint/octoprint CVSS 3.1HIGH 8.8
  • TI-2022-03320 Failure to Sanitize Special Elements into a Different Plane (Special Element Injection) in octoprint/octoprint CVSS 3.1MEDIUM 6.0
  • TI-2022-02664 Unrestricted Upload of File with Dangerous Type in octoprint/octoprint CVSS 3.1MEDIUM 5.4
  • TI-2025-35988 OctoPrint is Vulnerable to RCE Attacks via Unsanitized Filename in File Upload CVSS 4.0HIGH 7.5
  • TI-2024-18796 OctoPrint XSS via the "Snapshot Test" feature in Classic Webcam plugin settings CVSS 3.1MEDIUM 4.8
  • TI-2022-02678 Insufficient Session Expiration in octoprint/octoprint CVSS 3.1MEDIUM 4.4
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences