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: 0.4% (27th 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, 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: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100CISA 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
27th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (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 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 rangeFix by version rangeDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (29 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
jupyterlab4.0.11+ds1+~cs11.25.27-7 ... 4.4.8+ds1+~3.1.0+~0.16.6+~cs1.4.4-1 (26 versions)
  • every version up to 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4: fixed in 4.4.10+ds1+~3.1.0+~0.16.6+~cs1.4.4-4
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
jupyterlab0.0.1 ... 4.5.9 (587 versions)
  • 4.6.0 up to 4.6.2: fixed in 4.6.2
  • every version up to 4.5.10: fixed in 4.5.10
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 93× 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 155 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

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 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 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73626?
CVE-2026-73626 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73626?
A fix for CVE-2026-73626 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73626 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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