Quick answers
- Is CVE-2026-87983 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-87983 being exploited in the wild.
- How severe is CVE-2026-87983?
- Informational severity, with a CVSS score of 9.2, published 11 September 2026.
- Which products and versions are affected?
- Mistral Vibe 2.6.0 and later.
- Is there a fix for CVE-2026-87983?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-87983 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-87983?
- Check whether you run Mistral Vibe 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.
Technical details
This is a path traversal vulnerability (CWE-22) in Mistral Vibe's workspace restriction logic located in vibe/core/tools/builtins/bash.py. The vulnerable _extract_commands() function uses the raw text of parsed bash syntax nodes, including shell quotation marks, when reconstructing commands for the permission check. When is_path_within_workdir() evaluates a quoted path like "/etc/bashrc", it treats it as relative (since the first character is a quote, not a forward slash) and incorrectly determines it lies within the workspace. The allowlisted command (cat, head, tail, stat, wc) is approved without user interaction. However, the original bash command is executed with the quotation marks stripped by the shell, giving it access to the absolute path outside the workspace. The fix requires normalizing string nodes before path validation to work with effective shell arguments rather than raw tokens.
Affected products
- Mistral Vibe 2.6.0 and later
Timeline
- 2026-09-11: disclosed