CVE-2026-66297

HIGHNVD 8.08.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.0 under NVD CVSS v3. EPSS exploit probability: 2.4% (83rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.4%CVSS: 8.0Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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 v3
8.0
EG Score
8.0HIGHmedium confidence
EG Risk
52
EG Risk 52/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity80% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
2.4%
EPSS %ILE
83rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 5, 2026

Last Modified

August 10, 2026

Advisory Details (6)

Auto-updated Aug 5, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit f8fe9c62cb8b (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit f8fe9c62cb8b — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/f8fe9c62cb8bfc1dd0ccda4ea4a57c5e91563c85
github_commit

commit 0c2487326bbb (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit 0c2487326bbb — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/0c2487326bbb37cb1eb43bb2f76eb93ad9f8fd6b
github_commit

commit b2a8416d1490 (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit b2a8416d1490 — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/b2a8416d149043132fe5a14ed611e0fefc9dc9cd
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-66297
generic

CVE-2026-66297

https://cna.erlef.org/cves/CVE-2026-66297.html
githubMentions a patch (unverified)🟡 PoC Available

Unescaped deployment environment variables in generated setup commands · Advisory · livebook-dev/livebook · GitHub

https://github.com/livebook-dev/livebook/security/advisories/GHSA-qpjc-w5mm-73mj

Affected Packages

(1 across 1 ecosystem)
Hex(1)
PackageVulnerable rangeFix by version rangeDependents
livebook0.13.0 ... 0.19.8 (45 versions)
  • 0.13.0 up to 0.18.7: fixed in 0.18.7
  • 0.19.0 up to 0.19.9: fixed in 0.19.9
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
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  1. 2026-09-23 03:24 UTCEG score recompute
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  71. 2026-08-10 15:29 UTCEG score recompute▲ 3.10
  72. 2026-08-10 15:28 UTCNVD updateCVSS v3 → 8 · severity → HIGH
  73. 2026-08-09 22:28 UTCEG score recompute
  74. 2026-08-09 13:47 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-66297?
CVE-2026-66297 is a high vulnerability published on August 5, 2026. 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.dockerinstructions/2 and…
When was CVE-2026-66297 disclosed?
CVE-2026-66297 was first published on August 5, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66297 actively exploited?
CVE-2026-66297 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% probability of exploitation in the next 30 days (83rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66297?
CVE-2026-66297 has a CVSS v3 base score of 8.0 (NVD).
How do I remediate CVE-2026-66297?
A fix for CVE-2026-66297 is available: update to the fixed version the vendor names in its advisory.

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