CVE-2026-41882
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn JetBrains IntelliJ IDEA before 2024.3.7.1, 2025.1.7.1, 2025.2.6.2, 2025.3.4.1, 2026.1.1 reading arbitrary local files was possible via built-in web server
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA path traversal vulnerability in IntelliJ IDEA's built-in web server allows remote unauthenticated attackers to read arbitrary local files on the host system by manipulating file paths in HTTP requests. This affects multiple version branches prior to the patched releases.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 2024.3.7.1= 2025.1.7.1= 2025.2.6.2= 2025.3.4.1= 2026.1.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check your IntelliJ IDEA versionOpen IntelliJ IDEA, go to Help > About (on Windows/Linux) or IntelliJ IDEA > About (on macOS). Note the version number displayed (e.g., 2024.3, 2025.1, etc.).Affected if The version shown is earlier than 2024.3.7.1, 2025.1.7.1, 2025.2.6.2, 2025.3.4.1, or 2026.1.1, or if the version matches exactly one of the affected versions listed.
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Verify the built-in web server is enabledOpen Settings (or Preferences on macOS) > Build, Execution, Deployment > Debugger > Web Server. Check if the built-in web server is enabled and note the port number (default is 63342).Affected if The built-in web server is currently enabled and running.
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Confirm web server accessibilityOpen a web browser and navigate to http://localhost:63342 (or the configured port). If a page loads or responds, the web server is accessible.Affected if The web server responds to HTTP requests, meaning it is network-accessible from the local machine.
You are affected if your IntelliJ IDEA version is earlier than the patched releases AND the built-in web server feature is enabled and accessible.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpdate IntelliJ IDEA to version 2024.3.7.1, 2025.1.7.1, 2025.2.6.2, 2025.3.4.1, 2026.1.1 or later to remediate the vulnerability.
IntelliJ IDEA 2026.1.1 (or latest stable release)
- Navigate to https://www.jetbrains.com/idea/download/
- Download IntelliJ IDEA version 2026.1.1 (or the latest version available)
- Install the new version, ensuring to back up your settings if desired
- Restart IntelliJ IDEA after installation
- Verify the built-in web server functionality works correctly after upgrade
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation1.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-41882 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-41882 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data