No exploitation reportedFix available

CVE-2023-49080

Q: Is CVE-2023-49080 actively exploited?

Active exploitation of CVE-2023-49080 has not been confirmed. Its EPSS score was 0.8% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-49080?

CVE-2023-49080 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

No exploitation reported by the sources we read.

Published2023-12-04
Fixed in2.11.2
WeaknessCWE-209

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The Jupyter Server provides the backend (i.e. the core services, APIs, and REST endpoints) for Jupyter web applications like Jupyter notebook, JupyterLab, and Voila. Unhandled errors in API requests coming from an authenticated user include traceback information, which can include path information. There is no known mechanism by which to trigger these errors without authentication, so the paths revealed are not considered particularly sensitive, given that the requesting user has arbitrary execution permissions already in the same environment. A fix has been introduced in commit `0056c3aa52` which no longer includes traceback information in JSON error responses. For compatibility, the traceback field is present, but always empty. This commit has been included in version 2.11.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Timeline

dates in UTC

2023-12-0421:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-25 15:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-49080?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-49080?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Jupyter jupyter server

Branch	Affected	Fixed in	Source
2.11	< 2.11.2	2.11.2	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Jupyter jupyter server to 2.11.2

Advisories and patches

github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CNACVSS 3.13.5read 2026-10-23
NVDCVSS 3.14.3read 2026-10-23
CNAweakness (CWE)CWE-209read 2026-10-23
FIRST EPSSEPSS score0.8 %2026-10-25
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Published: 2023-12-04
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-49080?

Is CVE-2023-49080 actively exploited?

Active exploitation of CVE-2023-49080 has not been confirmed. Its EPSS score was 0.8% on 2026-10-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-49080?

CVE-2023-49080 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

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