{"id":901168,"date":"2026-10-21T13:00:00","date_gmt":"2026-10-21T16:00:00","guid":{"rendered":"https:\/\/lexflowcrm.com.br\/blog\/?p=901168"},"modified":"2026-10-15T19:12:37","modified_gmt":"2026-10-15T22:12:37","slug":"prompt-injection-em-peticao-stf","status":"publish","type":"post","link":"https:\/\/lexflowcrm.com.br\/blog\/prompt-injection-em-peticao-stf\/","title":{"rendered":"Prompt injection em peti\u00e7\u00e3o: STF detecta comandos ocultos e aciona OAB e MPF"},"content":{"rendered":"

O Supremo Tribunal Federal identificou, pela primeira vez, uma tentativa de prompt injection em peti\u00e7\u00e3o: instru\u00e7\u00f5es escondidas no arquivo para tentar levar sistemas de intelig\u00eancia artificial a decidir a favor de uma das partes. Em voto apresentado \u00e0 Primeira Turma, em sess\u00e3o virtual iniciada em 25 de setembro de 2026, o relator votou pela aplica\u00e7\u00e3o de multa de dois sal\u00e1rios m\u00ednimos e mandou comunicar o epis\u00f3dio \u00e0 OAB e ao Minist\u00e9rio P\u00fablico Federal.<\/p>\n

Como os comandos foram encontrados<\/h2>\n

O alerta chegou ao gabinete em 3 de setembro, enviado pelo N\u00facleo de Intelig\u00eancia Artificial do setor de tecnologia do STF. De acordo com os t\u00e9cnicos, a pe\u00e7a trazia trechos invis\u00edveis a olho nu, escritos em fonte branca e bem pequena. Esses trechos misturavam argumentos e ordens dirigidas a ferramentas de IA, pedindo a admiss\u00e3o e o provimento do recurso. Al\u00e9m disso, algumas palavras apareciam quebradas de forma estranha, justamente para escapar de filtros.<\/p>\n

Quem encontrou o conte\u00fado foi a Maria Shield, recurso da plataforma Maria, que o pr\u00f3prio STF desenvolveu para apoiar servidores na an\u00e1lise de processos e na reda\u00e7\u00e3o de documentos. Essa fun\u00e7\u00e3o procura padr\u00f5es suspeitos nas pe\u00e7as, como textos ocultos feitos para interferir no comportamento de sistemas de IA.<\/p>\n

A t\u00e9cnica tem nome conhecido: prompt injection, ou seja, inserir instru\u00e7\u00f5es num conte\u00fado que uma IA ler\u00e1, para mudar a resposta que ela vai dar.<\/p>\n

O que o relator decidiu sobre o prompt injection em peti\u00e7\u00e3o<\/h2>\n

A tentativa n\u00e3o teve efeito. O relator informou que seu gabinete n\u00e3o usa IA para examinar processos nem para fundamentar decis\u00f5es. Ademais, o STF j\u00e1 tinha negado o recurso em 19 de agosto, antes de o problema vir \u00e0 tona.<\/p>\n

A parte, ent\u00e3o, recorreu dessa decis\u00e3o com um agravo regimental. No voto, o relator manteve as raz\u00f5es da negativa, relatou o epis\u00f3dio e listou as provid\u00eancias. Para ele, a conduta fere o dever de lealdade que o artigo 77 do C\u00f3digo de Processo Civil imp\u00f5e a partes, procuradores e todos que atuam no processo, entre eles o de expor os fatos conforme a verdade. Assim, com base nesse artigo, veio a multa. A comunica\u00e7\u00e3o \u00e0 OAB serve para apurar eventual falta \u00e9tico-disciplinar; a do MPF, para verificar se houve crime.<\/p>\n

O caso de fundo envolve a anula\u00e7\u00e3o da nomea\u00e7\u00e3o de uma servidora aprovada em concurso, numa discuss\u00e3o sobre a reserva de vagas para pessoas negras. Esse recurso n\u00e3o avan\u00e7ou porque o tribunal de origem n\u00e3o tinha examinado as quest\u00f5es constitucionais e porque a revis\u00e3o exigiria reanalisar fatos, provas e regras do edital.<\/p>\n

Cuidados do escrit\u00f3rio para evitar prompt injection em peti\u00e7\u00e3o<\/h2>\n

Fica claro, com o epis\u00f3dio, que tribunais j\u00e1 procuram esse tipo de conte\u00fado. Para o escrit\u00f3rio, portanto, alguns h\u00e1bitos reduzem o risco de protocolar algo que n\u00e3o deveria estar ali:<\/p>\n

    \n
  1. Revise o arquivo final, n\u00e3o s\u00f3 a impress\u00e3o.<\/strong> Selecione todo o texto do PDF ou cole o conte\u00fado num editor simples: trechos em fonte branca ou min\u00fascula aparecem nesse teste.<\/li>\n
  2. Cheque modelos e pe\u00e7as de terceiros.<\/strong> Minutas recebidas de parceiros, modelos baixados da internet e textos gerados com IA podem trazer conte\u00fado escondido que ningu\u00e9m da equipe escreveu.<\/li>\n
  3. Escreva a regra.<\/strong> Deixe claro, na pol\u00edtica interna, que \u00e9 proibido inserir instru\u00e7\u00f5es ocultas, metadados com comandos ou qualquer recurso para influenciar sistemas do tribunal.<\/li>\n
  4. Guarde a vers\u00e3o protocolada.<\/strong> Arquive exatamente o PDF enviado, com data e respons\u00e1vel. Se houver questionamento, o escrit\u00f3rio consegue mostrar o que de fato juntou.<\/li>\n
  5. Conhe\u00e7a a responsabilidade.<\/strong> O artigo 77 do CPC atinge partes e procuradores. Para o advogado, por\u00e9m, o par\u00e1grafo 6\u00ba afasta as multas dos par\u00e1grafos 2\u00ba a 5\u00ba e deixa a apura\u00e7\u00e3o disciplinar com o \u00f3rg\u00e3o de classe, a quem o juiz deve oficiar.<\/li>\n<\/ol>\n

    O texto sobre intelig\u00eancia artificial na advocacia<\/a> re\u00fane outros limites \u00e9ticos no uso dessas ferramentas, e o guia de seguran\u00e7a da informa\u00e7\u00e3o no escrit\u00f3rio<\/a> ajuda a organizar quem revisa e quem protocola.<\/p>\n

    Revis\u00e3o como etapa fixa<\/h2>\n

    A confer\u00eancia do arquivo antes do protocolo costuma ser vista como detalhe, mas passa a ter peso \u00e9tico. Por isso, faz sentido transform\u00e1-la numa etapa obrigat\u00f3ria do fluxo de cada pe\u00e7a, com o nome de quem revisou e a data da checagem registrados junto ao caso.<\/p>\n

    Fonte: STF identifica uso de comandos ocultos para influenciar IA em processo e comunica OAB e MPF<\/a>, publicada pelo STF em 25\/09\/2026.<\/p>\n

    Agende uma demonstra\u00e7\u00e3o do LexFlow<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Prompt injection em peti\u00e7\u00e3o: o STF achou comandos ocultos para guiar IA num recurso e o relator votou por multa. Veja o caso e os cuidados do escrit\u00f3rio.<\/p>\n","protected":false},"author":4,"featured_media":901302,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[511],"tags":[289,63,587,615,633],"class_list":["post-901168","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticias-juridicas","tag-etica","tag-inteligencia-artificial","tag-lealdade-processual","tag-prompt-injection","tag-stf"],"yoast_head":"\nPrompt injection em peti\u00e7\u00e3o: o caso no STF<\/title>\n<meta name=\"description\" content=\"Prompt injection em peti\u00e7\u00e3o: o STF achou comandos ocultos para guiar IA num recurso e o relator votou por multa. 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