PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-86504 JetBrains CVE debrief

CVE-2026-86504 debrief based on the supplied source corpus. The vulnerability affects JetBrains IntelliJ IDEA versions before 2026.2.2, allowing host-level code execution due to missing project-trust confirmation before building a Dev Container. This issue has significant implications for defenders and security teams responsible for IntelliJ IDEA deployments. They should assess exposure and verify compensating controls to mitigate potential risks. The CVE record and NVD entry provide further details on this vulnerability.

Vendor
JetBrains
Product
IntelliJ IDEA
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-07
Original CVE updated
2026-09-07
Advisory published
2026-09-07
Advisory updated
2026-09-07

Who should care

Defenders and security teams responsible for IntelliJ IDEA deployments should assess exposure and verify compensating controls. Additionally, operators and platform administrators should review their environments to ensure that all instances of IntelliJ IDEA are updated to version 2026.2.2 or later. Vulnerability management and security teams should also prioritize verifying exposure and implementing compensating to

Why it matters

CVE-2026-86504 indicates missing project-trust confirmation before building a Dev Container in JetBrains IntelliJ IDEA before 2026.2.2 allowed host-level code execution. Defenders should prioritize verifying exposure in IntelliJ IDEA deployments and assessing compensating controls.

  • Host-level code execution requires verifying exposure and implementing compensating controls
  • Missing project-trust confirmation for Dev Container builds increases risk of code execution
  • IntelliJ IDEA deployments require assessment of project-trust confirmation and compensating controls

Technical summary

The CVE record and NVD entry indicate missing project-trust confirmation before building a Dev Container in JetBrains IntelliJ IDEA before 2026.2.2 allowed host-level code execution. This vulnerability has significant technical implications, as it enables attackers to execute code at the host level, potentially leading to unauthorized access and data breaches. Defenders should prioritize verifying exposure in IntelliJ IDEA deployments and assessing compensating controls to prevent exploitation.

Defensive priority

Defenders should prioritize verifying exposure in IntelliJ IDEA deployments and assessing compensating controls.

Recommended defensive actions

  • Verify IntelliJ IDEA version and check for updates to 2026.2.2 or later
  • Assess project-trust confirmation for Dev Container builds
  • Implement compensating controls for host-level code execution

Evidence notes

The CVE record and NVD entry indicate missing project-trust confirmation before building a Dev Container in JetBrains IntelliJ IDEA before 2026.2.2 allowed host-level code execution.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86504 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86504

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-86504 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86504

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.