How severe is CVE-2019-10856?

CVE-2019-10856 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-10856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-10856?

CVE-2019-10856 affects Jupyter Notebook. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-10856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-10856 published?

CVE-2019-10856 was published on 2019-04-04 and last updated on 2026-06-17.

CVE-2019-10856

CVE-2019-10856 is a medium-severity vulnerability in Jupyter Notebook with a CVSS 3.x base score of 6.1. 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-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Jupyter Notebook
Published: 2019-04-04
Last modified: 2026-06-17

Description

In Jupyter Notebook before 5.7.8, an open redirect can occur via an empty netloc. This issue exists because of an incomplete fix for CVE-2019-10255.

Frequently asked questions

What is CVE-2019-10856?: In Jupyter Notebook before 5.7.8, an open redirect can occur via an empty netloc. This issue exists because of an incomplete fix for CVE-2019-10255.
How severe is CVE-2019-10856?: CVE-2019-10856 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-10856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-10856?: CVE-2019-10856 affects Jupyter Notebook. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-10856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-10856 published?: CVE-2019-10856 was published on 2019-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jupyter:notebook:*:*:*:*:*:*:*:*

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