CVE-2026-15512: pig-mesh Pig RCE Vulnerability

CVE-2026-15512 Overview

CVE-2026-15512 is a code injection vulnerability [CWE-74] affecting pig-mesh Pig versions up to 3.9.2. The flaw resides in the pig-codegen component, specifically within the GeneratorServiceImpl.java file at \pig-master\pig-visual\pig-codegen\src\main\java\com\pig4cloud\pig\codegen\service\impl\GeneratorServiceImpl.java. Attackers can exploit the issue remotely over the network with low privileges required. A public exploit exists, increasing the likelihood of opportunistic abuse. The vendor was contacted before public disclosure but did not respond.

Critical Impact
Authenticated remote attackers can inject code through the code generation service, potentially altering generated artifacts and affecting confidentiality, integrity, and availability of the Pig platform.

Affected Products

pig-mesh Pig versions up to and including 3.9.2
pig-codegen component (code generation module)
GeneratorServiceImpl.java service implementation

Discovery Timeline

2026-07-13 - CVE-2026-15512 published to NVD
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-15512

Vulnerability Analysis

The vulnerability exists in the code generation service of pig-mesh Pig, an open-source rapid development platform. The GeneratorServiceImpl.java class within the pig-codegen component processes input used to generate application scaffolding. Insufficient neutralization of that input allows injection of code constructs that flow into generated output or execution contexts. The issue is classified under [CWE-74], covering improper neutralization of special elements in output used by a downstream component.

Because the code generator produces source artifacts that developers subsequently build and deploy, injected content can propagate into downstream systems. Exploitation requires network access and a low-privilege account on the Pig instance.

Root Cause

The root cause is missing or inadequate input sanitization in the code generation logic within GeneratorServiceImpl.java. Attacker-controlled parameters supplied to the generator are interpolated into code templates without proper escaping. This allows introduction of syntactic elements that are interpreted as code rather than treated as data.

Attack Vector

An authenticated attacker submits a crafted code generation request to the pig-codegen endpoint. The malicious payload is embedded into templated Java source or configuration output. When the generated artifacts are compiled, deployed, or executed, the injected code runs in the context of the application. Public proof-of-concept documentation is available at the GitHub PoC Documentation.

No verified exploit code is reproduced here. Refer to the VulDB Vulnerability Details entry for technical specifics.

Detection Methods for CVE-2026-15512

Indicators of Compromise

Unexpected code generation requests to pig-codegen endpoints containing template syntax, backticks, or Java reserved keywords in field names.
Generated source files or configuration artifacts containing unauthorized method calls, static initializers, or Runtime.exec references.
Anomalous outbound network connections originating from application hosts after code generation activity.

Detection Strategies

Inspect application logs for requests to GeneratorServiceImpl methods with unusual payload structures or oversized parameter values.
Perform static analysis on all artifacts produced by pig-codegen for injected constructs prior to build.
Compare hashes of generated files against expected templates to identify tampering.

Monitoring Recommendations

Enable audit logging for all authenticated calls to the code generation service and forward events to a centralized log platform.
Alert on privilege changes, new administrative sessions, or bulk generation activity from a single account.
Monitor Pig application processes for unexpected child process creation following code generation events.

How to Mitigate CVE-2026-15512

Immediate Actions Required

Restrict access to the pig-codegen component to trusted developer accounts only, and remove exposure from untrusted networks.
Review recent code generation activity in Pig instances running version 3.9.2 or earlier for evidence of malicious input.
Audit generated artifacts already deployed to production and compare against known-good baselines.

Patch Information

The vendor did not respond to disclosure attempts, and no official patch reference is listed in the CVE record. Track the VulDB CVE Entry and the upstream pig-mesh repository for a fixed release. Until a vendor patch is available, apply the workarounds below.

Workarounds

Place the Pig administrative interface behind a VPN or restrict it to internal management networks using firewall rules.
Apply strict allowlist validation on all input fields consumed by the code generator, rejecting characters used in Java syntax such as ;, {, }, and backticks.
Require code review of every artifact generated by pig-codegen before compilation or deployment.
Rotate credentials for accounts that hold code generation privileges and enforce multi-factor authentication where supported.

bash

# Example: restrict access to pig-codegen endpoints via reverse proxy
location /codegen/ {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://pig-backend;
}