CVE-2026-23892 json
OctoPrint has Timing Side-Channel Vulnerability in API Key Authentication
published 2026-01-27 9 mo ago modified 2026-07-07 4 mo ago also EUVD-2026-4775 , GHSA-xg4x-w2j3-57h6 , PYSEC-2026-1716
- cvss
- 5.9
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 37%
- public exploits
- 0
- none known
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.
Patch / fix
- pypi octoprint 1.11.6
- octoprint octoprint 1.11.6
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 9 mo ago
Exploit prediction
0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.0 | 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 |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| CNA | 4.0 | 6.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | octoprint | <1.11.6 |
1.11.6 |
Affected products
- OctoPrint OctoPrint
Classification
- Weakness
-
- CWE-208 Observable Timing Discrepancy
References
-
github.com
/OctoPrint/OctoPrint/commit/249fd80ab01bc4b7dabedff768230a0fb5d01a8c
web, patch
-
github.com
/OctoPrint/OctoPrint/security/advisories/GHSA-xg4x-w2j3-57h6
web, vendor-advisory
-
github.com
/OctoPrint/OctoPrint/releases/tag/1.11.6
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-23892
advisory
-
github.com
/OctoPrint/OctoPrint
package
-
pypi.org
/project/octoprint
package
-
github.com
/advisories/GHSA-xg4x-w2j3-57h6
advisory
Sources
- CVE List CVE-2026-23892
- GitHub Advisory GHSA-xg4x-w2j3-57h6
- NVD CVE-2026-23892
- OSV PYSEC-2026-1716
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.