CWE-1097 Base Incomplete

Persistent Storable Data Element without Associated Comparison Control Element

This weakness occurs when a persistent data object lacks the necessary methods to be properly compared, which can lead to inconsistent or incorrect behavior when the system checks for equality or…

Definition

What is CWE-1097?

This weakness occurs when a persistent data object lacks the necessary methods to be properly compared, which can lead to inconsistent or incorrect behavior when the system checks for equality or manages collections.
For reliable operation, objects designed for long-term storage (like those saved to a database or cached) must have explicit comparison logic. In Java, for instance, a persistent class requires both an `equals()` method to define what makes two instances identical and a `hashCode()` method to ensure consistent behavior in hash-based collections like `HashMap` or `HashSet`. Without these, the object's comparisons become unreliable. This inconsistency can cause subtle bugs, such as duplicate entries in a set, failed lookups, or corrupted data structures, degrading the application's reliability. If an attacker can trigger or exploit this flawed comparison logic, these reliability issues may escalate into security vulnerabilities, such as data corruption, denial of service, or unexpected access control bypasses.
Real-world impact

Real-world CVEs caused by CWE-1097

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-1097

  • 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-1097

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-1097 and opens a fix PR in under 60 seconds.

Codex Remedium scans every commit, identifies this exact weakness, and ships a reviewer-ready pull request with the patch. No tickets. No hand-offs.

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Frequently asked questions

Frequently asked questions

What is CWE-1097?

This weakness occurs when a persistent data object lacks the necessary methods to be properly compared, which can lead to inconsistent or incorrect behavior when the system checks for equality or manages collections.

How serious is CWE-1097?

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-1097?

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

How can I prevent CWE-1097?

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-1097?

Plexicus's SAST engine matches the data-flow signature for CWE-1097 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-1097?

MITRE publishes the canonical definition at https://cwe.mitre.org/data/definitions/1097.html. You can also reference OWASP and NIST documentation for adjacent guidance.

Related weaknesses

Weaknesses related to CWE-1097

CWE-1076 Parent

Insufficient Adherence to Expected Conventions

This weakness occurs when software code, design, documentation, or other components fail to follow established industry or…

CWE-1045 Sibling

Parent Class with a Virtual Destructor and a Child Class without a Virtual Destructor

This occurs when a base class defines a virtual destructor, but a derived class inherits from it without declaring its own virtual…

CWE-1070 Sibling

Serializable Data Element Containing non-Serializable Item Elements

This weakness occurs when a class or data structure is marked as serializable, but it contains one or more member elements that cannot be…

CWE-1078 Sibling

Inappropriate Source Code Style or Formatting

This weakness occurs when source code violates established style guidelines for formatting, indentation, whitespace, or commenting, making…

CWE-1079 Sibling

Parent Class without Virtual Destructor Method

This occurs when a base class, designed to be inherited from, does not declare its destructor as virtual. This oversight prevents proper…

CWE-1082 Sibling

Class Instance Self Destruction Control Element

This vulnerability occurs when an object's code contains logic that triggers its own deletion or destruction during runtime.

CWE-1087 Sibling

Class with Virtual Method without a Virtual Destructor

This occurs when a class defines a virtual method but does not also provide a virtual destructor.

CWE-1091 Sibling

Use of Object without Invoking Destructor Method

This weakness occurs when a program accesses an object but fails to properly call its destructor or finalizer method. This leaves the…

CWE-1098 Sibling

Data Element containing Pointer Item without Proper Copy Control Element

This weakness occurs when a data structure contains a pointer, but the code lacks proper methods to copy or initialize that pointer safely.

Resources

Further reading

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