A collateral attack is a challenge to a judgment or conviction outside the ordinary direct-review process. It asks whether a recognized legal route permits relief from, or refusal to give effect to, that earlier judgment. It is not an automatic second appeal whenever the losing party believes the result was wrong.

The important questions are which procedure applies, what defect it recognizes and what limits govern it. The building, judge or case number alone does not supply the answer: some post-conviction motions return to the sentencing court. Terminology also differs between civil judgment challenges and criminal collateral review. The federal examples below do not replace a state’s rules or the particular court’s requirements.

Direct appeal versus collateral attack

A direct appeal follows the ordinary appellate route for the judgment being challenged. It can address reviewable legal errors, subject to appealability, preservation, standards of review and filing rules. A motion asking the original court to reconsider or set aside its own judgment is another procedural possibility; it is not automatically an appeal just because it uses the same case number.

Collateral proceedings have their own authorized grounds and gates. For example, a federal prisoner’s §2255 motion is filed in the court that imposed sentence, yet serves a collateral-review function. Conversely, civil lawyers may distinguish a direct motion to vacate in the original action from an attack made when the judgment is invoked in another proceeding.

In Wall v. Kholi, 562 U.S. 545 (2011), the Supreme Court explained collateral review, for the statute before it, as judicial reexamination outside direct review. Its discussion helps distinguish the procedural route from a rigid “same court versus different court” test. A potentially available route still does not establish entitlement to relief.

Common review paths

The table is a routing guide, not a selection of a remedy for a particular person. State post-conviction remedies, family-law proceedings, bankruptcy rules and specialized courts can have additional rules or different terminology.

Civil judgments: wrong is not necessarily void

In federal civil litigation, Rule 60(b) recognizes specified grounds for relief: mistake or excusable neglect, qualifying newly discovered evidence, fraud or misconduct by an opposing party, voidness, specified changes affecting the judgment, and other reasons justifying relief. Each category has requirements. Calling an alleged error “fraud,” “unfair” or “jurisdictional” does not decide whether it meets them.

The official civil rules require Rule 60(b) motions within a reasonable time; grounds (1), (2) and (3) also face a one-year outer limit under Rule 60(c)(1). These are distinct limits, not permission to wait a year in every case. Rule 60(d) preserves certain separate powers, including an independent action and fraud-on-the-court relief. Those are not unrestricted alternatives whenever a Rule 60(b) motion fails.

Void is narrower than merely erroneous. In United Student Aid Funds, Inc. v. Espinosa, 559 U.S. 260 (2010), the Court described Rule 60(b)(4) as addressing rare jurisdictional defects or due-process failures depriving a party of notice or an opportunity to be heard. An ordinary legal error does not automatically make a judgment void. The procedural service failure in that case did not establish the claimed due-process violation where the creditor had actual notice of the plan.

Timing remains important even when voidness is alleged. In Coney Island Auto Parts Unlimited, Inc. v. Burton, No. 24-808 (January 20, 2026), the Court held that Rule 60(c)(1)’s reasonable-time requirement applies to Rule 60(b)(4) motions. It expressly did not decide whether the alleged service defect made that judgment void, and it did not determine what delay would be reasonable on different facts. Do not turn “void judgment” into “a motion can always be filed at any time.”

Personal jurisdiction and enforcement of another judgment

A court’s power over a person and proper service can matter when a default judgment is challenged or enforcement is sought elsewhere. But lack of jurisdiction is not established simply by asserting that the first court got something wrong. Participation, waiver, the record and earlier decisions about jurisdiction can change the analysis.

In Durfee v. Duke, 375 U.S. 106 (1963), the Supreme Court explained the general rule that a judgment receives full faith and credit even on jurisdictional questions that were fully and fairly litigated and finally decided in the original court. Relabeling a previously decided issue does not necessarily reopen it in the enforcing court.

This is why ignoring a lawsuit is risky. A possible later jurisdictional challenge is not assurance that the judgment can be defeated, that collection stops or that filing limits disappear. Promptly identify the original proceeding, service record, opportunities to object and any current enforcement deadline.

Criminal convictions and post-conviction review

A person in custody under a state-court judgment may seek federal habeas corpus relief under 28 U.S.C. §2254 on the ground that custody violates federal constitutional, statutory or treaty law. A disagreement about state law alone does not satisfy that federal custody ground. State remedies ordinarily must be exhausted, subject to statutory qualifications.

Where a state court decided the claim on its merits, §2254(d) imposes demanding limits concerning clearly established Supreme Court law or unreasonable factual determinations. Evidence development and hearings also have restrictions. The related §2244 contains limitation and second-or-successive-application rules. Neither asserting innocence nor identifying an alleged constitutional problem automatically supplies a hearing or relief.

A federal prisoner may use 28 U.S.C. §2255 to ask the sentencing court for relief on its specified grounds, including a sentence imposed in violation of federal law, without jurisdiction or above the legal maximum. The statute provides possible remedies such as vacating the judgment, resentencing, a new trial or correction where warranted. It also has a limitation period and narrow certification requirements for second or successive motions. Do not assume those rules match §2254 in every detail.

Changing the filing’s title may not avoid those gates. In Fernandez v. United States, No. 24-556 (May 28, 2026), the Supreme Court rejected using doubts about a conviction’s validity as extraordinary-and-compelling reasons for compassionate release under §3582(c)(1)(A), instead of the §2255 route. That holding concerns the attempted workaround; it does not make all requests for compassionate release collateral attacks.

Coram nobis and military justice

Coram nobis is an extraordinary remedy associated with fundamental defects in an earlier criminal judgment, with demanding requirements and limits on available alternatives. It is not a generic label for any late challenge. Federal civil Rule 60(e) abolishes specified old writs in that civil framework; that should not be confused with their treatment in criminal proceedings.

In United States v. Denedo, 556 U.S. 904 (2009), the Supreme Court held that the military appellate courts had jurisdiction to consider the particular coram nobis request concerning an earlier court-martial conviction. It distinguished authority to hear the request from whether the alleged fundamental defect justified relief. The Court did not decide that the applicant should win.

Military judgments therefore require attention to their own statutory review system, forum and finality rules. The All Writs Act does not independently expand a court’s subject-matter jurisdiction. Do not simply substitute an ordinary civilian motion or assume every military judgment remains open to reconsideration.

Five worked examples

These fictional situations illustrate procedural questions, not predictions or filing advice.

1. Ordinary reviewable error: A party says the trial court misinterpreted a statute, or wrongly admitted evidence affecting the result. If an appeal is available, those are examples of issues to assess through the direct appellate route, including preservation and the applicable standard. Missing that route does not automatically convert either complaint into a permitted collateral attack.
2. New evidence or alleged fraud in a civil case: A litigant discovers a document or alleges that the opponent concealed material information. A Rule 60 analysis asks about the actual ground, diligence, effect and timing. The discovery is not itself proof that the judgment is void or that the party can bypass the motion requirements by filing another lawsuit.
3. A default judgment raised during enforcement: A person learns that an earlier judgment is being enforced and disputes service or personal jurisdiction. The relevant service and notice record, any prior jurisdiction ruling, applicable procedure and timing all require review. The allegation alone neither invalidates the judgment nor stops enforcement.
4. A constitutional claim about state custody: A state prisoner alleges a federal constitutional defect in the conviction. State post-conviction procedures and possible §2254 review must be distinguished from a direct appeal. Exhaustion, prior decisions, limitation rules and the actual claim determine whether federal review can proceed.
5. A federal sentence challenge: A federal prisoner claims the sentence exceeded the lawful maximum. Section 2255 provides a potential framework in the sentencing court, but the facts, claim, deadlines and previous filings still matter. Calling the filing a new petition or request for leniency does not settle those questions.

Why finality and res judicata matter

Courts must resolve disputes with decisions on which parties and others can rely. Res judicata concerns the preclusive effect of earlier judgments. Claim preclusion can prevent repeating the same claim; issue preclusion concerns issues actually litigated and resolved in a valid determination essential to the earlier judgment. The governing jurisdiction, parties, judgment and issue determine the actual requirements. There is no safe universal “three elements” shortcut for every context discussed here.

Keep four concepts separate:

• Direct appeal is the ordinary appellate review route.
• Collateral attack describes a challenge outside that ordinary route, subject to its own authority and limits.
• Collateral review describes the court’s examination through such a route; the particular statute can define its scope.
• Void judgment identifies a narrow legal defect, not every wrong decision and not a guaranteed procedural exemption.

Here, “collateral” describes the relationship to direct review. It differs from property pledged as collateral for a loan.

Five questions that identify a possible path

1. What judgment and case type are involved? Identify civil, state criminal, federal criminal or military proceedings and the governing court.
2. What ordinary review was available or used? Identify the decision, notices, motions and appeals. Do not assume a missed or unsuccessful appeal creates a new remedy.
3. What custody, forum and jurisdiction requirements apply? A state prisoner’s habeas application, a federal sentencing motion and a civil enforcement defense have different foundations.
4. What legally recognized defect is alleged? Distinguish an ordinary legal error, qualifying new evidence or fraud, a narrow voidness claim and a cognizable constitutional custody claim.
5. What timing and prior-filing restrictions apply? Check the relevant triggering events, pending proceedings, prior rulings and any authorization requirement. A one-year label or “reasonable time” does not calculate the filing date for an individual case.

Common questions

Is a collateral attack the same as an appeal?

No. Direct appeal follows the ordinary review route; collateral procedures have separate authority, grounds and restrictions. A collateral proceeding may itself produce an appealable decision, but that does not turn it into the original direct appeal or guarantee further review.

Can new evidence support a collateral attack?

Sometimes, through an applicable procedure with its particular requirements. Rule 60(b)(2), §2254’s evidence restrictions and §2255(h)’s second-or-successive standards address different questions. New evidence is neither categorically excluded nor an automatic way around finality, diligence or filing limits.

Can a void judgment be challenged at any time?

Do not assume so. For federal Rule 60(b)(4) motions, Coney Island confirms the reasonable-time requirement. Other procedures and jurisdictions need separate analysis; neither a voidness allegation nor a citation to an older case establishes an unlimited filing window.

Can I file after losing an appeal?

A permitted post-judgment or post-conviction route may exist, but an unsuccessful appeal does not create one. Already decided issues, failure to present claims earlier, custody requirements, deadlines and successive-filing rules can matter. The actual claim and procedural history must be assessed.

Does another appeal necessarily reach the Supreme Court?

No. As the U.S. Courts’ appeals guide explains, requesting Supreme Court review by certiorari ordinarily does not require the Court to grant it. Further appellate review and collateral relief are distinct questions, each with its own rules.

Related terms: Judgment, Civil Case, Appeal.

Identify the judgment, governing procedure and immediate deadlines before relying on the label “collateral attack.” Obtain case-specific legal advice about a potential challenge or enforcement response rather than treating this framework as permission to reopen a concluded case.