CVE-2026-73626

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 88% 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, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the is_install_allowed coroutine to never execute, so the extension allowlist/blocklist check was not enforced for direct callers of install(). The stock JupyterLab HTTP API and Extension Manager UI are not affected, as they perform a separate, correctly awaited check. The issue affects only deployments where a custom extension or downstream integration imports PyPIExtensionManager and calls install() directly with a package name influenced by untrusted input, an allowlist/blocklist is configured, the PyPI Extension Manager is enabled, and kernels and terminals are disabled or delegated to remote hosts. Fixed in JupyterLab 4.6.2 and 4.5.10.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 13, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available. Sources: github.
generic

JupyterLab before 4.6.2 Authentication Bypass via PyPIExtensionManager | Advisories | VulnCheck

https://www.vulncheck.com/advisories/jupyterlab-before-authentication-bypass-via-pypiextensionmanager
github Patch Available

Allowlist/blocklist check in `PyPIExtensionManager.install()` not enforced for direct callers (missing `await`) · Advisory · jupyterlab/jupyterlab · GitHub

https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-whvh-wf3x-g77j

Vendor Advisories for CVE-2026-73626(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (27 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (26 versions)4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4—
PyPI(1)
PackageVulnerable rangeFixed inDependents
jupyterlab0.0.1 ... 4.5.9 (587 versions)4.5.10—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 91× 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 110 total refreshes for this CVE.

  1. 2026-09-19 05:53 UTCEG score recompute
  2. 2026-09-19 05:52 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 16:55 UTCGHSA enrichment
  5. 2026-09-18 02:31 UTCEG score recompute
  6. 2026-09-18 02:31 UTCGHSA enrichment
  7. 2026-09-17 13:39 UTCGHSA enrichment
  8. 2026-09-17 00:33 UTCEG score recompute
  9. 2026-09-17 00:33 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 11:41 UTCEG score recompute
  12. 2026-09-16 11:41 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 22:38 UTCGHSA enrichment
  15. 2026-09-15 09:45 UTCEG score recompute
  16. 2026-09-15 09:45 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-14 20:53 UTCGHSA enrichment
  19. 2026-09-14 06:08 UTCGHSA enrichment
  20. 2026-09-13 17:16 UTCEG score recompute
  21. 2026-09-13 17:16 UTCGHSA enrichment
  22. 2026-09-13 04:24 UTCGHSA enrichment
  23. 2026-09-12 15:32 UTCEG score recompute
  24. 2026-09-12 15:32 UTCGHSA enrichment
  25. 2026-09-12 15:02 UTCEPSS rescore
Show 75 more
  1. 2026-09-12 02:40 UTCEG score recompute
  2. 2026-09-12 02:40 UTCGHSA enrichment
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-11 13:45 UTCEG score recompute
  5. 2026-09-11 13:45 UTCGHSA enrichment
  6. 2026-09-10 22:37 UTCGHSA enrichment
  7. 2026-09-10 09:45 UTCEG score recompute
  8. 2026-09-10 09:45 UTCGHSA enrichment
  9. 2026-09-10 09:35 UTCEPSS rescore
  10. 2026-09-09 20:51 UTCGHSA enrichment
  11. 2026-09-09 17:58 UTCGHSA enrichment
  12. 2026-09-09 05:06 UTCEG score recompute
  13. 2026-09-09 05:06 UTCGHSA enrichment
  14. 2026-09-08 22:01 UTCEPSS rescore
  15. 2026-09-07 20:09 UTCEG score recompute
  16. 2026-09-07 20:09 UTCGHSA enrichment
  17. 2026-09-07 07:16 UTCGHSA enrichment
  18. 2026-09-06 17:55 UTCEG score recompute
  19. 2026-09-06 17:55 UTCGHSA enrichment
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-06 05:02 UTCGHSA enrichment
  22. 2026-09-05 16:11 UTCEG score recompute
  23. 2026-09-05 16:11 UTCGHSA enrichment
  24. 2026-09-05 03:18 UTCGHSA enrichment
  25. 2026-09-04 14:26 UTCEG score recompute
  26. 2026-09-04 14:26 UTCGHSA enrichment
  27. 2026-09-04 05:07 UTCEPSS rescore
  28. 2026-09-04 01:33 UTCGHSA enrichment
  29. 2026-09-03 12:40 UTCGHSA enrichment
  30. 2026-09-02 23:20 UTCEG score recompute
  31. 2026-09-02 23:20 UTCGHSA enrichment
  32. 2026-09-02 14:12 UTCEPSS rescore
  33. 2026-09-02 02:45 UTCEG score recompute
  34. 2026-09-02 02:45 UTCGHSA enrichment
  35. 2026-09-01 13:54 UTCEPSS rescore
  36. 2026-09-01 13:33 UTCEG score recompute
  37. 2026-09-01 13:33 UTCGHSA enrichment
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-09-01 04:40 UTCEPSS rescore
  40. 2026-09-01 00:42 UTCGHSA enrichment
  41. 2026-08-31 11:49 UTCGHSA enrichment
  42. 2026-08-30 22:57 UTCEG score recompute
  43. 2026-08-30 22:57 UTCGHSA enrichment
  44. 2026-08-30 19:18 UTCEPSS rescore
  45. 2026-08-30 19:17 UTCEPSS rescore
  46. 2026-08-30 10:06 UTCEG score recompute
  47. 2026-08-30 10:06 UTCGHSA enrichment
  48. 2026-08-30 01:22 UTCEPSS rescore
  49. 2026-08-29 21:11 UTCGHSA enrichment
  50. 2026-08-29 08:19 UTCEG score recompute
  51. 2026-08-29 08:19 UTCGHSA enrichment
  52. 2026-08-28 21:42 UTCEPSS rescore
  53. 2026-08-28 16:45 UTCEG score recompute
  54. 2026-08-28 16:45 UTCGHSA enrichment
  55. 2026-08-28 15:33 UTCEG score recompute▲ 7.50
  56. 2026-08-28 15:32 UTCGHSA enrichment
  57. 2026-08-28 15:25 UTCMITRE cvelistV5CVSS v3 → 7.5 · CVSS v4 → 7.7 · severity → HIGH
  58. 2026-08-28 10:10 UTCGHSA enrichment
  59. 2026-08-27 14:25 UTCEPSS rescore
  60. 2026-08-26 14:47 UTCEPSS rescore
  61. 2026-08-25 13:49 UTCEPSS rescore
  62. 2026-08-25 10:48 UTCGHSA enrichment
  63. 2026-08-23 00:19 UTCEPSS rescore
  64. 2026-08-22 11:31 UTCGHSA enrichment
  65. 2026-08-21 23:49 UTCEPSS rescore
  66. 2026-08-20 22:56 UTCEPSS rescore
  67. 2026-08-19 17:04 UTCEPSS rescore
  68. 2026-08-19 12:13 UTCGHSA enrichment
  69. 2026-08-18 13:49 UTCEPSS rescore
  70. 2026-08-18 13:49 UTCEPSS rescore
  71. 2026-08-17 13:47 UTCEPSS rescore
  72. 2026-08-16 14:56 UTCEPSS rescore
  73. 2026-08-16 14:56 UTCEPSS rescore
  74. 2026-08-16 12:53 UTCEG score recompute
  75. 2026-08-16 12:53 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-73626?
CVE-2026-73626 is a high vulnerability published on August 13, 2026. JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install(). A missing 'await' caused the isinstallallowed coroutine to never execute, so the extension allowlist/blocklist check was not enforced for direct callers of install().…
When was CVE-2026-73626 disclosed?
CVE-2026-73626 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73626 actively exploited?
CVE-2026-73626 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 87.9% of all scored CVEs.
What is the CVSS score of CVE-2026-73626?
CVE-2026-73626 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-73626?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73626, 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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