Pumpkin-MC/Pumpkin · error · ChatError

sent a chat with invalid/no signature

Error message

sent a chat with invalid/no signature

What it means

Guard variant of ChatError for the Java chat-signing flow: the incoming chat message is missing a valid signature (or has none) while the server enforces secure chat. Fires when a client sends unsigned chat on a profile/key setup that requires signed messages — e.g. modified clients or clients that skipped the session key negotiation. The bad input is the unsigned/invalidly-signed chat packet body.

Solutions

1. Kick the player for unsigned chat
2. Verify signatures before broadcasting the message
3. Log the failure with the player name

When it happens

Trigger: Thrown at crates/pumpkin/src/net/java/play/mod.rs:130 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Pumpkin-MC/Pumpkin@8d4639e25a (2026-09-09). Data as JSON: /api/errors/fcaee8c4a6529f48. Report an issue: GitHub.

Appendix: source

Thrown at crates/pumpkin/src/net/java/play/mod.rs:130

        }
    }

    fn client_kick_reason(&self) -> Option<String> {
        match self {
            Self::BlockOutOfReach | Self::BlockOutOfWorld | Self::InvalidGamemode => None,
            Self::InvalidBlockFace => Some("Invalid block face".into()),
            Self::InvalidHand => Some("Invalid hand".into()),
        }
    }
}

#[derive(Debug, Error)]
pub enum ChatError {
    #[error("sent an oversized message")]
    OversizedMessage,
    #[error("sent a message with illegal characters")]
    IllegalCharacters,
    #[error("sent a chat with invalid/no signature")]
    UnsignedChat,
    #[error("has too many unacknowledged chats queued")]
    TooManyPendingChats,
    #[error("sent a chat that couldn't be validated")]
    ChatValidationFailed,
    #[error("sent a chat with an out of order timestamp")]
    OutOfOrderChat,
    #[error("has an expired public key")]
    ExpiredPublicKey,
    #[error("attempted to initialize a session with an invalid public key")]
    InvalidPublicKey,
}

impl PumpkinError for ChatError {
    fn is_kick(&self) -> bool {
        true
    }

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