Quick answers
- Is CVE-2026-123305 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123305 being exploited in the wild.
- How severe is CVE-2026-123305?
- High severity, with a CVSS score of 7.5, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains IntelliJ IDEA before 2026.3.
- Is there a fix for CVE-2026-123305?
- Yes: fixed in IntelliJ IDEA 2026.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123305 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-123305?
- Check whether you run Jetbrains IntelliJ IDEA at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: IntelliJ IDEA 2026.3
Technical details
A path traversal vulnerability exists in the Dev Container archive unpacking functionality of IntelliJ IDEA. The vulnerability allows an attacker to craft a malicious archive containing relative path traversal sequences (e.g., "../") that bypass directory restrictions during extraction. This requires a developer to open or trust a remote Dev Container archive, and successful exploitation can result in arbitrary file write access within the developer's environment.
Affected products
- JetBrains IntelliJ IDEA before 2026.3
Timeline
- 2026-11-06: disclosed