CVE-2026-86049

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.41% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 35.5% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-24.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-17 20:28Z1 MO AGO

Last updated

2026-09-18 18:32Z1 MO AGO

Reserved

2026-09-04

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Weaknesses

• CWE-532Insertion of Sensitive Information into Log FileBase
• CWE-117Improper Output Neutralization for LogsBase

Data version

5.2

Document digest

b9d2eadea51dab3bbe03afc128b095f6fefa1949dc415c0e52ab23b7d3acebdc

• github.comhttps://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-c3mw-737p-c7g2x_refsource_CONFIRM
• github.comhttps://github.com/jupyter-server/jupyter_server/pull/1681x_refsource_MISC
• github.comhttps://github.com/jupyter-server/jupyter_server/commit/52513529af7096e622c00911b17627b266294717x_refsource_MISC
• github.comhttps://github.com/jupyter-server/jupyter_server/releases/tag/v2.21.0x_refsource_MISC