CWE-1095 Base Incompleto

Loop Condition Value Update within the Loop

This vulnerability occurs when a loop's exit condition depends on a variable that is also modified inside the loop body. This creates a complex and often unpredictable control flow that is difficult…

Definición

What is CWE-1095?

This vulnerability occurs when a loop's exit condition depends on a variable that is also modified inside the loop body. This creates a complex and often unpredictable control flow that is difficult to analyze.
This coding pattern creates a 'moving target' for the loop's logic, making the code's behavior hard to predict and reason about. Developers and security tools may struggle to determine how many times the loop will execute or under what conditions it will terminate, which can lead to infinite loops, incorrect calculations, or unexpected state changes. From a security perspective, this complexity acts as a breeding ground for bugs. It increases the time and effort needed for code reviews and security audits, making it easier for subtle logic flaws and boundary errors to slip through. These flaws can later manifest as denial-of-service conditions, data corruption, or other vulnerabilities that are difficult to trace back to the convoluted loop logic.
Impacto en el mundo real

Real-world CVEs caused by CWE-1095

Todavía no hay CVEs públicos enlazados a esta CWE en el catálogo de MITRE.

Cómo lo explotan los atacantes

Ruta del atacante paso a paso

  1. 1

    Identifica una ruta de código que maneje entrada no confiable sin validación.

  2. 2

    Crea un payload que ejercite el comportamiento inseguro — inyección, traversal, overflow o abuso de lógica.

  3. 3

    Envía el payload a través de una solicitud normal y observa la reacción de la aplicación.

  4. 4

    Itera hasta que la respuesta filtre datos, ejecute código del atacante o escale privilegios.

Ejemplo de código vulnerable

Vulnerable pseudo

MITRE no ha publicado un ejemplo de código para esta CWE. El patrón siguiente es ilustrativo — consulta Recursos para referencias canónicas.

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

Secure pseudo

Seguro 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.
Lista de prevención

How to prevent CWE-1095

  • 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.
Señales de detección

How to detect CWE-1095

SAST High

Ejecuta análisis estático (SAST) sobre el código buscando el patrón inseguro en el flujo de datos.

DAST Moderate

Ejecuta pruebas dinámicas de seguridad de aplicaciones (DAST) contra el endpoint en vivo.

Runtime Moderate

Vigila los logs en tiempo de ejecución para detectar trazas de excepción inusuales, entradas malformadas o intentos de bypass de autorización.

Code review Moderate

Revisión de código: marca cualquier código nuevo que maneje entrada desde esta superficie sin usar los helpers validados del framework.

CWE-1095

Don't catalog this weakness. Prove it's reachable.

Plexicus turns CWE catalogs into evidence: every CWE-pattern is matched against your real code graph, reach is proven on a sandbox clone, and verified findings ship as reviewed PRs.

Preguntas frecuentes

Frequently asked questions

¿Qué es CWE-1095?

This vulnerability occurs when a loop's exit condition depends on a variable that is also modified inside the loop body. This creates a complex and often unpredictable control flow that is difficult to analyze.

¿Qué gravedad tiene CWE-1095?

MITRE no ha publicado una calificación de probabilidad de explotación para esta debilidad. Trátala como de impacto medio hasta que tu modelo de amenazas demuestre lo contrario.

¿Qué lenguajes o plataformas se ven afectados por CWE-1095?

MITRE no ha especificado plataformas afectadas para esta CWE — puede aplicar a la mayoría de los stacks de aplicaciones.

¿Cómo puedo prevenir CWE-1095?

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.

¿Cómo detecta y corrige Plexicus CWE-1095?

El motor SAST de Plexicus detecta la firma de flujo de datos para CWE-1095 en cada commit. Cuando hay coincidencia, nuestro agente Codex Remedium abre un PR de corrección con el código corregido, las pruebas y un resumen de una línea para el revisor.

¿Dónde puedo aprender más sobre CWE-1095?

MITRE publica la definición canónica en https://cwe.mitre.org/data/definitions/1095.html. También puedes consultar la documentación de OWASP y NIST para guías relacionadas.

Debilidades relacionadas

Weaknesses related to CWE-1095

CWE-1120 Padre

Excessive Code Complexity

This weakness occurs when software contains sections of code that are unnecessarily intricate, as measured by established complexity…

CWE-1047 Hermano

Modules with Circular Dependencies

This weakness occurs when software modules have circular references, meaning Module A depends on Module B, which in turn depends back on…

CWE-1056 Hermano

Invokable Control Element with Variadic Parameters

This weakness occurs when a callable function or method is defined to accept a variable number of arguments (variadic parameters).

CWE-1060 Hermano

Excessive Number of Inefficient Server-Side Data Accesses

This weakness occurs when an application makes an excessive number of individual data queries to a server or database, instead of using…

CWE-1064 Hermano

Invokable Control Element with Signature Containing an Excessive Number of Parameters

This weakness occurs when a function, method, or subroutine is defined with an unnecessarily high number of parameters in its signature.

CWE-1075 Hermano

Unconditional Control Flow Transfer outside of Switch Block

This weakness occurs when code uses an unconditional jump, like a 'goto' statement, outside of a structured control flow block like a…

CWE-1080 Hermano

Source Code File with Excessive Number of Lines of Code

This weakness occurs when a single source code file grows excessively large, containing too many lines of code.

CWE-1119 Hermano

Excessive Use of Unconditional Branching

This weakness occurs when code relies heavily on unconditional jumps like 'goto' statements, making the program flow difficult to follow.

CWE-1121 Hermano

Excessive McCabe Cyclomatic Complexity

This weakness occurs when a function or method has an overly complex control flow, measured by a high McCabe Cyclomatic Complexity score.…

¿Listo para validar lo que importa?

Listo para validar lo que importa.

Plexicus es Proof-Driven AppSec: hallazgos validados, comprensión contextual y remediación revisada — anclada en evidencia, acotada contigo.

Calificación

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SAMPLE HANDOVER · ILLUSTRATIVE

Sample evidence handover

A trimmed view of what your team receives at the end of an AI Swarm Pentest engagement. Real engagements include full technical evidence, executive narrative, and a remediation plan.

VALIDATED FINDING Evidence attached

Server-Side Request Forgery in webhooks/receiver

demo-project/sample-app · src/webhooks/receiver.py:42

SeverityHigh CVSS 3.18.6 Priority79 Confirmedvia replay

Untrusted caller-supplied URLs reach an internal egress without an allowlist. Replayed in a sandbox against a fresh authorized target — the same control was validated to fail twice.

REVIEWER-READY REMEDIATION Merge-ready PR

Validate the target URL against an allowlist of permitted hostnames. Reject private/internal IP ranges. Enforce HTTPS only.

plexicus/remediation/webhooks-ssrf 3 changed · 0 new files
42resp = requests.get(target_url)
42+if not is_allowed_host(target_url):
43+  raise WebhookRejected(target_url)
44+resp = requests.get(target_url, timeout=5)
Every engagement hands over:
  • Executive briefing
  • Validated findings list
  • Merge-ready PRs
  • Compliance mapping (NIS2 · DORA · CRA)
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