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fix(security): [CRITICAL] resolve Denial of Service (DoS) vulnerability via State Exhaustion #165

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fix(security): [CRITICAL] resolve Denial of Service (DoS) vulnerability via State Exhaustion #165

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8 changes: 8 additions & 0 deletions src/main/java/org/eu/autogex/core/AbstractAutomatonBuilder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,9 @@
public abstract class AbstractAutomatonBuilder<
B extends AbstractAutomatonBuilder<B, A>, A extends Automaton> {

/** Maximum allowed states in an automaton to prevent memory exhaustion (DoS). */
private static final int MAX_STATES = 10000;

protected final Map<String, State> states = new HashMap<>();
protected final Set<State> finalStates = new HashSet<>();
protected State initialState;
Expand All @@ -37,8 +40,13 @@ protected AbstractAutomatonBuilder() {
* @param name The name of the state.
* @param isFinal True if the state is an accepting state.
* @return The current builder instance.
* @throws IllegalStateException if the maximum number of states is exceeded.
*/
public B addState(String name, boolean isFinal) {
if (!states.containsKey(name) && states.size() >= MAX_STATES) {
throw new IllegalStateException(
"Maximum number of states exceeded (Security: DoS prevention).");
}
State state = new State(name, isFinal);
states.put(name, state);
if (isFinal) {
Expand Down