Vulnerability in jupyterlab (CVE-2026-102904)
Summary
Vulnerability in jupyterlab (CVE-2026-102904). Risk of unauthorized operations or information disclosure. Exploitable via ExtensionHandler.post. Mitigation: upgrade to 4.5.11 or later.
Original description
The description as published by the source.
JupyterLab's PyPI extension manager runs python -m pip uninstall with the extension name taken from the request body. ExtensionHandler.post validates the name for cmd=install but not for cmd=uninstall, so a name that begins with - reaches the command line and pip reads it as an option rather than as a package.
cmdline = [
sys.executable,
"-m",
"pip",
"uninstall",
"--yes",
"--no-input",
extension,
]
An extension name of the form -r followed by a path therefore made pip open that path as a requirements file. pip's parse error quotes the line it could not read and names the file it came from, and JupyterLab returned that error in the response body, so the line reached the requester.
This has security implications only for deployments that combine all of the following:
- the (default) PyPI Extension Manager enabled, so that uninstall requests reach pip;
- an authenticated account permitted to call the extension API; and
- kernels and terminals disabled or delegated to remote hosts (otherwise a user with kernel access can read the same files and make the same outbound requests directly, regardless of this endpoint)
Unlike GHSA-37w4-hwhx-4rc4 and GHSA-89vp-jrxv-24w8, this does not need an allowlist or blocklist to be configured. The uninstall path never consu…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-102904 has been found in jupyterlab.
Attackers can target a specific entry point like ExtensionHandler.post over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.4/10.
What to do: upgrade jupyterlab to 4.5.11 or later.
If unsure, ask your IT team or search "jupyterlab CVE-2026-102904" on the vendor's site.
CVE-2026-102904 (jupyterlab) — CWE-88 / CVSS v3 5.4
Attack vector: remote (network-reachable) / no user interaction
Attack surface: ExtensionHandler.post / PyPIExtensionManager.uninstall / jupyterlab
Patched: 4.5.11 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-88) exists in jupyterlab. Attackers reach the vulnerable code path via ExtensionHandler.post.
Check the vendor advisory for the affected versions of jupyterlab. Attack surface: ExtensionHandler.post / PyPIExtensionManager.uninstall / jupyterlab.
Severity: Medium (CVSS 5.4/10). Risk of unauthorized operations or information disclosure.
Update to 4.5.11.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'jupyterlab' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'jupyterlab' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
jupyterlabを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade jupyterlab to 4.5.11ステージング環境で 4.5.11 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-102904 jupyterlab
- Ubuntu UBUNTU-CVE-2026-102904 jupyterlab
References
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- package pypi.org
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com