CVE-2026-86049

A flaw was found in Jupyter Server. The server's logging mechanism for HTTP 500 errors fails to properly redact sensitive information. When a request results in an HTTP 500 error and includes a Referer header containing a security token, this token is written to server logs in plaintext. An...

CVE-2026-86049

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

Linux Distros Unpatched Vulnerability : CVE-2026-86049

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer...

DEBIAN-CVE-2026-86049

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

CVE-2026-86049

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

Jupyter Server: 5xx request logging leaks token-bearing Referer header values

Summary When a request returns a 500, jupyterserver/log.py logs a small JSON block of request headers. The Referer header was copied into it as-is, so a token in the Referer URL ended up in the logs in plain text. Impact Anyone who can read the server logs can pick tokens out of these 500 entries...

GHSA-C3MW-737P-C7G2 Jupyter Server: 5xx request logging leaks token-bearing Referer header values

Summary When a request returns a 500, jupyterserver/log.py logs a small JSON block of request headers. The Referer header was copied into it as-is, so a token in the Referer URL ended up in the logs in plain text. Impact Anyone who can read the server logs can pick tokens out of these 500 entries...

CVE-2026-86049 Jupyter Server: 5xx request logging leaks token-bearing Referer header values

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

CVE-2026-86049

Jupyter Server (the backend for Jupyter web applications) prior to version 2.21.0 contains a token-leak flaw in the 5xx request logging path within jupyter_server/log.py. The Referer header is copied into a JSON header block without applying the same token scrubbing used for the request URI. When...

EUVD-2026-82436

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

CVE-2026-86049

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

CVE-2026-86049 Jupyter Server: 5xx request logging leaks token-bearing Referer header values

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

CVE-2026-86049 Jupyter Server: 5xx request logging leaks token-bearing Referer header values

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

CVE-2026-86049: Insertion of Sensitive Information into Log File

Jupyter Server is the backend for Jupyter web applications. Prior to version 2.21.0, the 5xx request logging path in jupyterserver/log.py copies the Referer header into a JSON header block without applying the token scrubbing used for the request URI. A request that returns HTTP 500 while the...

susvibes-jupyter-server-cve-2026-35397

SusVibes 基准测试任务：Jupyter Server 内容路径解析 本仓库包含一个完整的 SusVibes 风格基准测试任务，该任务基于 Jupyter Server 中一个真实的上游 Python 安全修复构建。 该任务旨在评估代理是否能够仅凭普通的 GitHub issue 风格提示重新实现被遮蔽的内容路径解析行为，而无需告知其原始上游变更修复了一个漏洞。功能测试检查普通的文件行为，而隐藏的安全测试则检查实现是否保留了根目录边界。 提交摘要 要求| 状态| 证据 ---|---|--- 真实 Python 安全修复| 完成|...

PYSEC-2026-3472 jupyter-server is vulnerable to CORS origin validation bypass when the `allow_origin_pat` configuration is used

A vulnerability in jupyter-server versions 1.12.0 through 2.17.0 allows an attacker to bypass CORS origin validation when the alloworiginpat configuration is used. The issue arises from the use of re.match for validating the Origin header, which only anchors at the start of the string. This allow...

PYSEC-2026-2532 Jupyter Server vulnerable to Path Traversal via incorrect root directory boundary check in _get_os_path()

A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the getospath function within jupyterserver/services/contents/fileio.py. The check uses startswithroot without appending a trailing path separator, allowing sibling...

PYSEC-2026-2534 JupyterLab vulnerable to potential authentication and CSRF tokens leak

Impact Users of JupyterLab who click on a malicious link may get their Authorization and XSRFToken tokens exposed to a third party when running an older jupyter-server version. Patches JupyterLab 4.1.0b2, 4.0.11, and 3.6.7 were patched. Workarounds No workaround has been identified, however users...

PYSEC-2026-1706 JupyterLab vulnerable to potential authentication and CSRF tokens leak

Impact Users of JupyterLab who click on a malicious link may get their Authorization and XSRFToken tokens exposed to a third party when running an older jupyter-server version. Patches JupyterLab 4.1.0b2, 4.0.11, and 3.6.7 were patched. Workarounds No workaround has been identified, however users...

Fedora 44 : python-jupyter-server (2026-dd1d19e58b)

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-dd1d19e58b advisory. New version fixing high-severity CVE. ---- New version of jupyter-server fixing various security vulnerabilities. Tenable has extracted the precedin...