Quick answers
- Is CVE-2026-123277 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123277 being exploited in the wild.
- How severe is CVE-2026-123277?
- Medium severity, with a CVSS score of 5, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains CLion before 2026.2.4.1, 2026.3.
- Is there a fix for CVE-2026-123277?
- Yes: fixed in CLion 2026.2.4.1, 2026.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-123277 attacked?
- It is attacked with local access, in a web application.
- Am I affected by CVE-2026-123277?
- Check whether you run Jetbrains CLion 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: CLion 2026.2.4.1, 2026.3
Technical details
CLion lacks authentication validation for debug session environment access on Linux, allowing unprivileged local users to read sensitive environment variables from running debug sessions. The vulnerability requires local system access but no elevated privileges or user interaction. An attacker can obtain credentials and environment configuration details that may be used for further attacks or privilege escalation.
Affected products
- JetBrains CLion before 2026.2.4.1, 2026.3
Timeline
- 2026-11-06: disclosed