Path Traversal in pptagent (CVE-2026-42078)
Summary
Path traversal in pptagent (CVE-2026-42078). Risk of unauthorized operations or information disclosure. Exploitable via markdown_table_to_image. Mitigation: upgrade to 1.1.36 or later.
Original description
The description as published by the source.
Summary
The markdown_table_to_image tool accepts a caller-controlled path parameter and passes it directly to get_html_table_image:
# pptagent/mcp_server.py:127-143
def markdown_table_to_image(markdown_table: str, path: str, css: str) -> str:
"""
Args:
path (str): The file path where the image will be saved
"""
html = markdown_to_html(markdown_table)
get_html_table_image(html, path, css) # ← no path validation
return f"Markdown table converted to image and saved to {path}"
# pptagent/utils.py:337-366
def get_html_table_image(html: str, output_path: str, css: str = None):
parent_dir, base_name = os.path.split(output_path)
if parent_dir and not os.path.exists(parent_dir):
os.makedirs(parent_dir) # ← creates arbitrary directories
hti = Html2Image(...)
hti.screenshot(
html_str=html,
css_str=css,
save_as=base_name, # ← writes image to any directory
size=(1000, 600),
)
os.makedirs(parent_dir) creates arbitrary directory trees, and Html2Image.screenshot writes the rendered image to parent_dir/base_name. Unlike download_file in the same project, there is no is_relative_to(workspace) guard. This behaviour can be fixed with the same pattern as the above.
Impact
The concrete attack scenarios include
- SSH key replacement:
path = "/home/user/.ssh/authorized_keys"— replaces the authorized_keys file…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-42078 has been found in pptagent.
Attackers can target a specific entry point like markdown_table_to_image over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade pptagent to 1.1.36 or later.
If unsure, ask your IT team or search "pptagent CVE-2026-42078" on the vendor's site.
CVE-2026-42078 (pptagent) — CWE-22
Attack vector: remote (network-reachable)
Attack surface: markdown_table_to_image / get_html_table_image / Html2Image.screenshot / download_file
Patched: 1.1.36 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Path traversal (CWE-22) exists in pptagent. Attackers reach the vulnerable code path via markdown_table_to_image.
Check the vendor advisory for the affected versions of pptagent. Attack surface: markdown_table_to_image / get_html_table_image / Html2Image.screenshot / download_file.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 1.1.36.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'pptagent' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'pptagent' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
pptagentを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade pptagent to 1.1.36ステージング環境で 1.1.36 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com