CVE-2026-19330Public exploit

Arbitrary JSON read and write via traversal

Published Aug 9, 2026 · Updated Aug 9, 2026

Path traversal in angrysky56 advanced-reasoning-mcp 1.0.0 allows local users to read and write arbitrary JSON files. The get_system_json and switch_memory_library handlers append caller-controlled names to storage paths without verifying that the resolved paths remain under memory_data. A connected MCP client can escape the intended storage roots to read JSON files or redirect later memory persistence writes to attacker-chosen JSON paths.

CVSS severityUnavailable
Unscored
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in angrysky56 advanced-reasoning-mcp 1.0.0 allows local users to read and write arbitrary JSON files. The get_system_json and switch_memory_library handlers append caller-controlled names to storage paths without verifying that the resolved paths remain under memory_data. A connected MCP client can escape the intended storage roots to read JSON files or redirect later memory persistence writes to attacker-chosen JSON paths.

The record

CVE
CVE-2026-19330
Published
Aug 9, 2026
Updated
Aug 9, 2026
Vendor
angrysky56
Product
advanced-reasoning-mcp
Classifications
CWE-22, T1565.001, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

angrysky56 · advanced-reasoning-mcpversion=1.0.0

Published CVSS scores

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
5.3VulDBCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
4.8VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Path Traversal
T1565.001Stored Data Manipulation
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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