Security readout for executives and security teams
Plain-English summary
BinderHub deployments before 0.2.0-n653 can be tricked with malicious input into running code in the BinderHub service context. That could expose deployment credentials and allow manipulation of images or user-created pods. Business impact is highest where BinderHub is internet-facing or tied to sensitive Kubernetes resources.
Executive priority
Treat this as urgent for any public or shared BinderHub service. The issue can compromise credentials and workloads, with possible broader Kubernetes impact depending on cluster hardening. Prioritize patching and credential review before routine maintenance.
Technical view
The issue is CWE-94 remote code execution in JupyterHub BinderHub before 0.2.0-n653. The advisory states crafted input may execute code in BinderHub context and expose JupyterHub API tokens, Kubernetes service accounts, and docker registry credentials. Host escalation depends on Kubernetes configuration.
Likely exposure
Organizations running BinderHub versions earlier than 0.2.0-n653 are affected, especially public Binder services accepting repository input. Exposure depends on deployment reachability, enabled repo providers, and Kubernetes permissions attached to BinderHub.
Exploitation context
The CVSS vector is network-accessible, low complexity, no privileges, and user interaction required. The source bundle does not show CISA KEV listing or cited evidence of active exploitation, so active exploitation should not be claimed.
Researcher notes
Evidence is strongest from the GitHub security advisory, CVE record, and patch reference. The bundle names the affected product and fixed version but does not include proof-of-concept details or confirmed exploitation. Avoid assuming host compromise unless the Kubernetes configuration permits escalation.
Mitigation direction
- Update BinderHub to 0.2.0-n653 or later.
- If updating is blocked, disable the git repo provider using BinderHub.repo_providers.
- Review vendor guidance before changing production deployment behavior.
- Rotate potentially exposed JupyterHub, Kubernetes, and docker registry credentials after remediation.
Validation and detection
- Inventory BinderHub deployments and confirm their running version.
- Check whether any deployment runs a version earlier than 0.2.0-n653.
- Verify whether the git repo provider is enabled where patching is delayed.
- Review Kubernetes permissions available to BinderHub service accounts.
- Assess whether exposed credentials could manipulate images, pods, or registry content.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-39159 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H2.86Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/jupyterhub/binderhub/security/advisories/GHSA-9jjr-qqfp-ppwxCVE reference · x_refsource_CONFIRM
- https://github.com/jupyterhub/binderhub/commit/195caac172690456dcdc8cc7a6ca50e05abf8182.patchCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.