CVE-2026-68746

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. 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
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Not Failing Securely ('Failing Open') vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams.

A Livebook Agent or App Server connected to Livebook Teams caches the identifier of the deployment group it belongs to, and resolves that identifier against a locally cached list of deployment groups on every request in order to decide whether Teams identity enforcement is active. Livebook.Hubs.TeamClient.handle_call/3 in lib/livebook/hubs/team_client.ex does not distinguish a deployment group that could not be resolved from one that was resolved with identity enforcement switched off: the clause matches only the case where a group was found with enforcement enabled, and falls through to a catch-all that reports enforcement as switched off for everything else. The two neighbouring functions that decide user and application access resolve the same identifier and treat the same unresolved result as a denial.

When the identity status is reported as switched off, Livebook.ZTA.LivebookTeams.authenticate/3 in lib/livebook/zta/livebook_teams.ex returns empty identity metadata and allows the request to continue instead of halting it. LivebookWeb.UserPlug.build_current_user/3 merges that empty metadata into a newly built user, whose access type defaults to full access, and LivebookWeb.AuthPlug.authorized?/1 grants access to any user holding full access.

The cached identifier becomes unresolvable when the deployment group it refers to is deleted while the agent is not connected to receive the change, most concretely when a deployment group is deleted during the window in which an agent is disconnected or reconnecting. The client removes the group from its cached list without clearing the identifier that refers to it. Any client able to reach the affected server over the network is then granted the same access as a fully privileged member of the organisation, including the ability to read notebooks and configured secrets, execute code on the server's runtime, and disrupt its operation.

This issue affects livebook: from 0.19.7 before 0.19.9.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 10, 2026

Advisory Details (6)

Auto-updated Aug 5, 2026
Patch available. Sources: github, github_commit.
github_commit

commit 2d3a2c710c88 (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit 2d3a2c710c88 — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/2d3a2c710c880abd24a2bc888d3cf5239d98cf72
github_commit

commit d6d0dfa746b1 (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit d6d0dfa746b1 — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/d6d0dfa746b172540442852f74de4a9deacc433b
github_commit

commit d374e90647ed (livebook-dev/livebook)

Fix landed in livebook-dev/livebook commit d374e90647ed — awaiting tagged release

https://github.com/livebook-dev/livebook/commit/d374e90647edbb00286bfee9182c0161d29a8e07
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-68746
generic

CVE-2026-68746

https://cna.erlef.org/cves/CVE-2026-68746.html
github Patch Available

Livebook Teams Identity fails open to full unauthenticated access after a deployment group becomes unresolvable in the agent local cache · Advisory · livebook-dev/livebook · GitHub

https://github.com/livebook-dev/livebook/security/advisories/GHSA-74j5-6grg-g6wj

Affected Packages

(1 across 1 ecosystem)
Hex(1)
PackageVulnerable rangeFixed inDependents
livebook0.19.7, 0.19.80.19.9—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 43× 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.

  1. 2026-08-25 18:32 UTCEG score recompute
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-24 17:38 UTCEG score recompute
  4. 2026-08-23 04:20 UTCEG score recompute
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-22 03:32 UTCEG score recompute
  7. 2026-08-21 23:49 UTCEPSS rescore
  8. 2026-08-21 02:44 UTCEG score recompute
  9. 2026-08-20 22:56 UTCEPSS rescore
  10. 2026-08-20 00:28 UTCEG score recompute
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 23:40 UTCEG score recompute
  13. 2026-08-18 13:49 UTCEPSS rescore
  14. 2026-08-18 13:49 UTCEPSS rescore
  15. 2026-08-17 22:45 UTCEG score recompute
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-16 21:57 UTCEG score recompute
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 09:32 UTCEG score recompute
  21. 2026-08-16 02:15 UTCEPSS rescore
  22. 2026-08-15 08:45 UTCEG score recompute
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 07:56 UTCEG score recompute
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 18 more
  1. 2026-08-12 18:36 UTCEG score recompute
  2. 2026-08-12 13:51 UTCEPSS rescore
  3. 2026-08-11 17:46 UTCEG score recompute
  4. 2026-08-11 05:13 UTCEG score recompute
  5. 2026-08-11 00:00 UTCEPSS rescore
  6. 2026-08-10 16:49 UTCEG score recompute▲ 1.10
  7. 2026-08-10 16:49 UTCNVD updateCVSS v3 → 8.8
  8. 2026-08-09 18:59 UTCEG score recompute
  9. 2026-08-09 13:47 UTCEPSS rescore
  10. 2026-08-08 18:11 UTCEG score recompute
  11. 2026-08-08 16:37 UTCEPSS rescore
  12. 2026-08-07 17:22 UTCEG score recompute
  13. 2026-08-06 15:48 UTCEG score recompute
  14. 2026-08-06 15:33 UTCEG score recompute
  15. 2026-08-06 13:47 UTCEPSS rescore
  16. 2026-08-05 20:32 UTCEG score recompute
  17. 2026-08-05 20:15 UTCEG score recompute
  18. 2026-08-05 20:15 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-68746?
CVE-2026-68746 is a high vulnerability published on August 5, 2026. Not Failing Securely ('Failing Open') vulnerability in livebook-dev livebook allows an unauthenticated network client to obtain full access to a Livebook server that enforces identity through Livebook Teams. A Livebook Agent or App Server connected to Livebook Teams caches the identifier of the…
When was CVE-2026-68746 disclosed?
CVE-2026-68746 was first published in the National Vulnerability Database 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-2026-68746 actively exploited?
CVE-2026-68746 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.9% of all scored CVEs.
What is the CVSS score of CVE-2026-68746?
CVE-2026-68746 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-68746?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-68746, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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