VulnerabilityAnalyzed

CVE-2026-66297

Improper Neutralization of Special Elements used in an OS Command (OS Command Injection) vulnerability in livebook-dev livebook allows command injection into generated deployment setup commands.

MEDIUM 5.0EPSS 1.88%

Does this matter?

Lower severity and a low EPSS score (1.88%). Track it; it rarely justifies an emergency change on its own.

Description

Improper Neutralization of Special Elements used in an OS Command (OS Command Injection) vulnerability in livebook-dev livebook allows command injection into generated deployment setup commands. LivebookWeb.Hub.Teams.DeploymentGroupAgentComponent.docker_instructions/2 and LivebookWeb.Hub.Teams.DeploymentGroupAgentComponent.fly_instructions/4 in lib/livebook_web/live/hub/teams/deployment_group_agent_component.ex interpolate deployment group environment variable values into the generated Docker and Fly.io setup commands without shell escaping. The values originate from the deployment group configuration and reach the sinks through Livebook.Hubs.Dockerfile.online_docker_info/3. Both sinks place the value inside a double-quoted shell word, so a value containing a command substitution such as $(...) or backticks is evaluated by the shell without any need to break out of the quoting, and a literal double quote terminates the quoted word and allows arbitrary further tokens. The generated command is displayed in the Livebook web interface with a copy button, so a user who copies it and runs it without reviewing it first executes the injected commands on their own machine, under their own account. An attacker requires privileges sufficient to set deployment group environment variables, while the resulting code execution occurs on the machine of whoever runs the generated command. The Kubernetes instructions are not affected, because they render the same values into a YAML manifest with escaping rather than into a shell command. This issue affects livebook: from 0.13.0 before 0.18.7 and from 0.19.0 before 0.19.9.

CVSS 4.0: 5.0 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 1.88% probability · 78th percentile
CISA KEV: Not listed
Weakness: CWE-78
Affected: livebook/livebook
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

References

https://cna.erlef.org/cves/CVE-2026-66297.htmlVendor Advisory
https://github.com/livebook-dev/livebook/commit/0c2487326bbb37cb1eb43bb2f76eb93ad9f8fd6bPatch
https://github.com/livebook-dev/livebook/commit/b2a8416d149043132fe5a14ed611e0fefc9dc9cdPatch
https://github.com/livebook-dev/livebook/commit/f8fe9c62cb8bfc1dd0ccda4ea4a57c5e91563c85Patch
https://github.com/livebook-dev/livebook/security/advisories/GHSA-qpjc-w5mm-73mjExploit, Patch, Vendor Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-66297Third Party Advisory
https://github.com/livebook-dev/livebook/security/advisories/GHSA-qpjc-w5mm-73mjExploit, Patch, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.