CVE-2026-49988 Repomix: attach_packed_output can bypass file-read secret scanning for supported local files
Attackers can bypass secret scanning to read arbitrary local files via the Repomix MCP server, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49988?
CVE-2026-49988 is a medium-severity vulnerability in yamadashy repomix, published on 15 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Repomix is a tool that packs repositories into AI-friendly files. Prior to 1.14.1, the Repomix MCP server attach_packed_output and read_repomix_output flow can register and read arbitrary local .json, .txt, .md, or .xml files without the file_system_read_file runSecretLint() safety check or Repomix packed-output validation, allowing MCP callers to bypass the local file-read secret-scanning boundary. This issue is fixed in version 1.14.1.
Weakness: CWE-200
Which versions are affected by CVE-2026-49988?
2 open source packages ship an affected version, including repomix. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
repomix npm | All versions | 1.14.1 |
repomix npm | All versions | 1.14.1 |
Products include Yamadashy Repomix.
How do I fix CVE-2026-49988?
Upgrade repomix to 1.14.1 or later.
Is CVE-2026-49988 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49988 exists.
Other vulnerabilities in yamadashy repomix
Sources
Also known as GHSA-hwpp-h97w-2h3j.