🛡️ CVE-2026-23892 — octoprint

🟡 CVSS 5.9 — Medium ✅ No Known Exploit CWE-208 OSV
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

OctoPrint has Timing Side-Channel Vulnerability in API Key Authentication

Impact

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.

Patches

The vulnerability will be patched in version 1.11.6.

Workaround

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!

Credits

This vulnerability was discovered and responsibly disclosed to OctoPrint by [Knox Liu](https://github.com/yueyueL).

How this vulnerability can be exploited

This issue can be reached from an adjacent network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity none, availability none.

Affected software

CVE-2026-23892 is recorded against 1 package.

  • octoprint (fixed in 1.11.6)

Timeline and source

Published on 27 January 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CWE CWE-208
Public Exploit ✅ No
Source OSV
Published 2026-01-27
Updated 2026-08-12
Modified 2026-07-07

Affected Packages

Software From version Fixed in
octoprint — 1.11.6

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