CWE-1101 Base Incomplete

Reliance on Runtime Component in Generated Code

This vulnerability occurs when software depends on automatically generated code that requires a specific, often external, runtime component to function. Without this component, the code cannot…

Definition

What is CWE-1101?

This vulnerability occurs when software depends on automatically generated code that requires a specific, often external, runtime component to function. Without this component, the code cannot execute, creating a fragile and non-portable foundation.
This reliance on a specific runtime environment creates significant maintenance challenges. It locks the application to a particular ecosystem, making updates, deployments, and debugging more complex and time-consuming. This extra complexity indirectly harms security by slowing down the process of identifying and patching vulnerabilities, as developers must navigate the added layer of the runtime dependency. Furthermore, this pattern makes it easier to accidentally introduce security flaws. Generated code can be difficult to audit and understand, and its tight coupling with a runtime component can obscure how data flows or where validation should occur. This lack of transparency increases the risk of introducing vulnerabilities during modifications or when integrating the generated code with other parts of the application.
Real-world impact

Real-world CVEs caused by CWE-1101

No public CVE references are linked to this CWE in MITRE's catalog yet.

How attackers exploit it

Step-by-step attacker path

  1. 1

    Identify a code path that handles untrusted input without validation.

  2. 2

    Craft a payload that exercises the unsafe behavior — injection, traversal, overflow, or logic abuse.

  3. 3

    Deliver the payload through a normal request and observe the application's reaction.

  4. 4

    Iterate until the response leaks data, executes attacker code, or escalates privileges.

Vulnerable code example

Vulnerable pseudo

MITRE has not published a code example for this CWE. The pattern below is illustrative — see Resources for canonical references.

Vulnerable pseudo 
// Example pattern — see MITRE for the canonical references.
function handleRequest(input) {
  // Untrusted input flows directly into the sensitive sink.
  return executeUnsafe(input);
}
Secure code example

Secure pseudo

Secure pseudo 
// Validate, sanitize, or use a safe API before reaching the sink.
function handleRequest(input) {
  const safe = validateAndEscape(input);
  return executeWithGuards(safe);
}
What changed: the unsafe sink is replaced (or the input is validated/escaped) so the same payload no longer triggers the weakness.
Prevention checklist

How to prevent CWE-1101

  • Architecture Use safe-by-default frameworks and APIs that prevent the unsafe pattern from being expressible.
  • Implementation Validate input at trust boundaries; use allowlists, not denylists.
  • Implementation Apply the principle of least privilege to credentials, file paths, and runtime permissions.
  • Testing Cover this weakness in CI: SAST rules + targeted unit tests for the data flow.
  • Operation Monitor logs for the runtime signals listed in the next section.
Detection signals

How to detect CWE-1101

SAST High

Run static analysis (SAST) on the codebase looking for the unsafe pattern in the data flow.

DAST Moderate

Run dynamic application security testing against the live endpoint.

Runtime Moderate

Watch runtime logs for unusual exception traces, malformed input, or authorization bypass attempts.

Code review Moderate

Code review: flag any new code that handles input from this surface without using the validated framework helpers.

Plexicus auto-fix

Plexicus auto-detects CWE-1101 and opens a fix PR in under 60 seconds.

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Frequently asked questions

Frequently asked questions

What is CWE-1101?

This vulnerability occurs when software depends on automatically generated code that requires a specific, often external, runtime component to function. Without this component, the code cannot execute, creating a fragile and non-portable foundation.

How serious is CWE-1101?

MITRE has not published a likelihood-of-exploit rating for this weakness. Treat it as medium-impact until your threat model proves otherwise.

What languages or platforms are affected by CWE-1101?

MITRE has not specified affected platforms for this CWE — it can apply across most application stacks.

How can I prevent CWE-1101?

Use safe-by-default frameworks, validate untrusted input at trust boundaries, and apply the principle of least privilege. Cover the data-flow signature in CI with SAST.

How does Plexicus detect and fix CWE-1101?

Plexicus's SAST engine matches the data-flow signature for CWE-1101 on every commit. When a match is found, our Codex Remedium agent opens a fix PR with the corrected code, tests, and a one-line summary for the reviewer.

Where can I learn more about CWE-1101?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1101.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1101

CWE-710 Parent

Improper Adherence to Coding Standards

This weakness occurs when developers don't consistently follow established coding standards and best practices, which can introduce…

CWE-1041 Sibling

Use of Redundant Code

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CWE-1044 Sibling

Architecture with Number of Horizontal Layers Outside of Expected Range

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CWE-1048 Sibling

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CWE-1059 Sibling

Insufficient Technical Documentation

This weakness occurs when a software or hardware product lacks comprehensive technical documentation. Missing or incomplete details about…

CWE-1061 Sibling

Insufficient Encapsulation

This weakness occurs when a software component exposes too much of its internal workings, such as data structures or implementation logic.…

CWE-1065 Sibling

Runtime Resource Management Control Element in a Component Built to Run on Application Servers

This weakness occurs when an application built to run on a managed application server bypasses the server's high-level APIs and instead…

CWE-1066 Sibling

Missing Serialization Control Element

This weakness occurs when a class or data structure is marked as serializable but lacks the required control methods to properly handle…

CWE-1068 Sibling

Inconsistency Between Implementation and Documented Design

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Resources

Further reading

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