Can my husband forge divorce documents to get remarried?

Given the facts you describe, this is an apparent case of fraud. Your husband not only perpetrated a fraud against you (intrinsic fraud) but also a very serious fraud against the court (extrinsic fraud). However, the burden of proof is usually on the one asserting fraud, and you will have to show that your signature on the divorce documents was forged.

In Grissom v. Grissom (30 Cal. App. 4th 40, 35 Cal. Rptr. 2d 530), the wife petitioner asserted that her husband fraudulently misrepresented papers that he gave her to sign; he told her that the papers were forms for "Appearance, Stipulation and Waiver" that would dismiss their pending divorce action. However, the language in those papers stipulated a property division and a waiver of service notification that the waived any rights for the wife to be notified about any divorce action. The husband sought the divorce but continued to live with the wife, who subsequently discovered his actions ten years later. The court determined that the husband had committed an extrinsic fraud upon the court and the instruments were voided.

The court also declared that "where a confidential relation exists and one of the parties signs an instrument without reading it in reliance on false representations as to its contents by the other party, the instrument may be avoided." If your husband induced your signature through misrepresentation, or if he clearly forged your name on the divorce documents, you do have a case for fraud, which could nullify the divorce.

Definitely consult a divorce attorney regarding the divorce laws as well as fraud laws in your state to determine whether your husband committed a fraud upon the court.