How severe is CVE-2021-39160?

CVE-2021-39160 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39160 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39160?

CVE-2021-39160 affects Jupyterhub Nbgitpuller. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-39160?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-39160 published?

CVE-2021-39160 was published on 2021-08-25 and last updated on 2026-06-17.

CVE-2021-39160

CVE-2021-39160 is a critical-severity vulnerability in Jupyterhub Nbgitpuller with a CVSS 3.x base score of 9.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.6)
CVSS v2: 6.8
EPSS exploit prediction: 2% (75th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Jupyterhub Nbgitpuller
Published: 2021-08-25
Last modified: 2026-06-17

Description

nbgitpuller is a Jupyter server extension to sync a git repository one-way to a local path. Due to unsanitized input, visiting maliciously crafted links could result in arbitrary code execution in the user environment. This has been resolved in version 0.10.2 and all users are advised to upgrade. No work around exist for users who can not upgrade.

Frequently asked questions

What is CVE-2021-39160?: nbgitpuller is a Jupyter server extension to sync a git repository one-way to a local path. Due to unsanitized input, visiting maliciously crafted links could result in arbitrary code execution in the user environment. This has been resolved in version 0.10.2 and all users are advised to upgrade. No work around exist for users who can not upgrade.
How severe is CVE-2021-39160?: CVE-2021-39160 has a CVSS 3.x base score of 9.6, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39160 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (75th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39160?: CVE-2021-39160 affects Jupyterhub Nbgitpuller. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-39160?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-39160 published?: CVE-2021-39160 was published on 2021-08-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jupyterhub:nbgitpuller:*:*:*:*:*:*:*:*

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