OctoPrint is Vulnerable to RCE Attacks via Unsanitized Filename in File UploadGHSA-49mj-x8jp-qvfc
HIGHFix: OctoPrint/OctoPrint@be4201eGHSA-49mj-x8jp-qvfc is a high-severity (CVSS 8.8) OS Command Injection vulnerability in octoprint. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for octoprint — see the affected versions and patch details below.
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-49mj-x8jp-qvfc.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
octoprintReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
OctoPrint versions up until and including 1.11.2 contain a vulnerability that allows an authenticated attacker to upload a file under a specially crafted filename that will allow arbitrary command execution if said filename becomes included in a command defined in a system event handler and said event gets triggered.
If no event handlers executing system commands with uploaded filenames as parameters have been configured, this vulnerability does not have an impact.
Patches
The vulnerability will be patched in version 1.11.3.
Workaround
Until the patch has been applied, OctoPrint administrators who have event handlers configured that include any kind of filename based placeholders (i.e. {__filename}, {__filepath}, {filename}, {path}, etc -- refer to the events documentation for a full list) should disable those by setting their enabled property to False or unchecking the "Enabled" checkbox in the GUI based Event Manager.
Alternatively, OctoPrint administrators should set feature.enforceReallyUniversalFilenames to true in config.yaml and restart OctoPrint, then vet the existing uploads and make sure to delete any suspicious looking files (e.g. those that contain a ; in their name followed by a command).
As always, OctoPrint administrators are advised to not expose OctoPrint on hostile networks like the public internet, and to vet who has access to their instance.
Credits
This vulnerability was discovered and responsibly disclosed to OctoPrint by @prabhatverma47.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | octoprint | all versions | 1.11.3pip install --upgrade 'octoprint==1.11.3' |
Affected Products
octoprintoctoprintResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
OctoPrint 1.11.2 - File Upload
by prabhat · Feb 4, 2026
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for octoprint, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update octoprint to 1.11.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-49mj-x8jp-qvfc is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is GHSA-49mj-x8jp-qvfc in your dependencies?
Find it across PyPI, including transitive dependencies.