gravitational/teleport · error

proto: IdentityCenterAccountAssignment: illegal tag %d (wire

Error message

proto: IdentityCenterAccountAssignment: illegal tag %d (wire type %d)

What it means

Generic protobuf decoding guard in the generated Unmarshal for IdentityCenterAccountAssignment. It fires when the binary wire data contains a field tag that is zero or negative (fieldNum <= 0), which is illegal in the protobuf wire format — a symptom of corrupted, maliciously crafted, or wrongly-versioned serialized bytes rather than a valid message.

Source

Thrown at api/client/proto/authservice.pb.go:60959

				return ErrIntOverflowAuthservice
			}
			if iNdEx >= l {
				return io.ErrUnexpectedEOF
			}
			b := dAtA[iNdEx]
			iNdEx++
			wire |= uint64(b&0x7F) << shift
			if b < 0x80 {
				break
			}
		}
		fieldNum := int32(wire >> 3)
		wireType := int(wire & 0x7)
		if wireType == 4 {
			return fmt.Errorf("proto: IdentityCenterAccountAssignment: wiretype end group for non-group")
		}
		if fieldNum <= 0 {
			return fmt.Errorf("proto: IdentityCenterAccountAssignment: illegal tag %d (wire type %d)", fieldNum, wire)
		}
		switch fieldNum {
		case 1:
			if wireType != 2 {
				return fmt.Errorf("proto: wrong wireType = %d for field Kind", wireType)
			}
			var stringLen uint64
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowAuthservice
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := dAtA[iNdEx]
				iNdEx++
				stringLen |= uint64(b&0x7F) << shift
				if b < 0x80 {

View on GitHub (pinned to 1283425b60)

Solutions

1. Verify sender and receiver use compatible protobuf definitions/versions of authservice
2. Check for truncated or corrupted payloads and re-send the request

When it happens

Trigger: Thrown at api/client/proto/authservice.pb.go:60959 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of gravitational/teleport@1283425b60 (2026-09-02). Data as JSON: /api/errors/d9ce8d93ecb6b7fc. Report an issue: GitHub.