---
id: CVE-2026-29870
title: >-
  A directory traversal vulnerability in the agentic-context-engine project
  versions up to 0.7.1 allows arbitrary file writes via the checkpoint_dir
  parameter in OfflineACE.run
summary: >-
  A directory traversal vulnerability in the agentic-context-engine project
  versions up to 0.7.1 allows arbitrary file writes via the checkpoint_dir
  parameter in OfflineACE.run. The save_to_file method in ace/skillbook.py fails
  to normaliz…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L'
cwe:
  - CWE-22
published: '2026-03-31'
updated: '2026-07-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-29870'
references:
  - url: >-
      https://github.com/lilmingwa13/security-research/blob/main/CVE-2026-29870.md
    label: cve@mitre.org
tags:
  - nvd
epss: 0.008
epssPercentile: 0.54801
ingestedAt: '2026-07-25T10:53:53.779Z'
---

## Overview

A directory traversal vulnerability in the agentic-context-engine project versions up to 0.7.1 allows arbitrary file writes via the checkpoint_dir parameter in OfflineACE.run. The save_to_file method in ace/skillbook.py fails to normalize or validate filesystem paths, allowing traversal sequences to escape the intended checkpoint directory. This vulnerability allows attackers to overwrite arbitrary files accessible to the application process, potentially leading to application corruption, privilege escalation, or code execution depending on the deployment context.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.